ASCP Phlebotomy Technician (PBT) Certification Exam — Questions and Answers

Question 1: Which of the following is the correct procedure for labeling specimens?

Label the tubes at the bedside immediately after collection (Correct answer)
Let another staff member label the tubes later
Use only the patient’s initials on the label
Label all tubes after leaving the patient’s room

Correct answer: Label the tubes at the bedside immediately after collection

Proper labeling at the point of collection reduces errors and ensures the specimen is accurately matched to the patient.

Question 2: Which culture medium is selective for gram-negative bacteria?

Thioglycollate broth
MacConkey agar (Correct answer)
Chocolate agar
Blood agar

Correct answer: MacConkey agar

MacConkey agar inhibits gram-positive bacteria (using bile salts and crystal violet) and differentiates gram-negatives by lactose fermentation.

Question 3: Which hospital department offers mobility therapy to patients?

kinesthetics
respiratory therapy
physical therapy (Correct answer)
personal training

Correct answer: physical therapy

Physical therapy is the hospital department dedicated to helping patients improve or restore their physical function, mobility, and strength. Therapists in this department use various exercises and techniques to aid recovery from injury, illness, or surgery. Respiratory therapy, in contrast, focuses on lung function and breathing.

Question 4: What can happen if alcohol isn't given enough time to thoroughly dry during site preparation?

There is impact if the alcohol fails to completely dry.
Hematoma.
Hemolysis. (Correct answer)
Hemoconcentration.

Correct answer: Hemolysis.

Cell walls may become damaged by alcohol. Hemolysis happens if the wound hasn't entirely dried.

Question 5: Small pinpoint hemorrhages (petechiae) appearing on the forearm after tourniquet application may indicate:

Superficial phlebitis
A coagulation or platelet disorder (Correct answer)
Local infection at the venipuncture site
A normal response to tourniquet pressure

Correct answer: A coagulation or platelet disorder

Petechiae suggest abnormal platelet function or a coagulopathy and should be reported to the ordering clinician.

Question 6: Which sample is most likely to contain Trichinella larvae?

brain biopsy
muscle biopsy (Correct answer)
wound
nasopharyngeal

Correct answer: muscle biopsy

Trichinella species are parasitic nematodes that cause trichinellosis, an infection acquired by consuming undercooked meat containing larvae. After maturing in the intestine, new larvae migrate from the intestine to muscle tissue, where they encyst. Therefore, a muscle biopsy is the most appropriate sample for detecting Trichinella larvae in infected individuals, as this is where the parasites primarily reside.

Question 7: Which tube has the thrombin needed for the STAT serum test?

all of these
lavender
orange (Correct answer)
gold

Correct answer: orange

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Question 8: Which of the following actions may lead to hemolysis of the blood sample?

Allowing alcohol to dry before puncture
Inverting the tubes gently
Drawing from a vein without a tourniquet
Using a small bore needle (Correct answer)

Correct answer: Using a small bore needle

Small gauge needles can cause red blood cells to rupture due to high pressure during collection, leading to hemolysis.

Question 9: Which of the following claims about the norm for infection control precautions is untrue?

resuscitation devices may be used as an alternative to mouth-to-mouth resuscitation
use both hands to recap needles (Correct answer)
standard precautions apply to all secretions except sweat
hands should be washed before putting on and after removing gloves

Correct answer: use both hands to recap needles

Recapping needles using both hands is a dangerous practice that significantly increases the risk of accidental needlestick injuries. Standard infection control precautions, including OSHA guidelines, strictly prohibit recapping needles by hand. Instead, safety-engineered devices or the one-handed scoop method should be used if recapping is absolutely necessary, though proper disposal in a sharps container is always preferred.

Question 10: A patient spells their name differently than what appears on the requisition. The phlebotomist should:

Draw blood using the name on the requisition
Proceed and note the discrepancy in the chart after the draw
Ask the patient to confirm and correct the requisition before drawing (Correct answer)
Cancel the draw without notifying anyone

Correct answer: Ask the patient to confirm and correct the requisition before drawing

Any discrepancy in patient information must be resolved before specimen collection to prevent misidentification errors.

Question 11: In the Laboratory Response Network for Biological Threats, sentinel laboratories play which of the following roles?

Specialized handling of biological agents that are highly contagious, identification of the origin of illness outbreaks, and characterization of novel organisms and viruses.
Obtain and process clinical or environmental samples at high risk for testing on behalf of other organizations.
Provide other laboratories instruction and direction.
Perform regular diagnostic procedures and determine if samples need to be sent somewhere else for additional testing. (Correct answer)

Correct answer: Perform regular diagnostic procedures and determine if samples need to be sent somewhere else for additional testing.

Sentinel laboratories are the first line of defense in the Laboratory Response Network (LRN) for biological threats. Their primary role is to perform routine diagnostic testing on clinical samples. If a sample exhibits characteristics suspicious for a high-consequence biological agent, sentinel laboratories are responsible for ruling out common pathogens and then referring the sample to a higher-level LRN laboratory for definitive identification and advanced testing.

Question 12: Drawing blood from an arm with a running IV in the same vein will MOST likely cause:

Elevated red blood cell count
Falsely elevated analyte concentrations
Increased hemoglobin values
Falsely decreased analyte concentrations due to dilution with IV fluid (Correct answer)

Correct answer: Falsely decreased analyte concentrations due to dilution with IV fluid

IV fluids contaminate the blood sample and dilute its components, causing falsely low results for most analytes.

Question 13: Hemolysis: What is it?

insufficient red blood cells
red serum red
not enough white blood cells
the breakdown of erythrocytes (Correct answer)

Correct answer: the breakdown of erythrocytes

Platelets, also known as thrombocytes, are small, anucleated cell fragments that are crucial for blood clotting (hemostasis). When a blood vessel is injured, platelets aggregate at the site of injury to form a plug, initiating the coagulation cascade and preventing excessive blood loss. They are essential for wound healing and maintaining vascular integrity.

Question 14: Which vein is frequently utilized to take a patient's blood when they are obese?

median cubital
axillary vein
basilic vein
cephalic vein (Correct answer)

Correct answer: cephalic vein

Lavender-stoppered tubes contain Ethylenediaminetetraacetic acid (EDTA) as an anticoagulant. EDTA works by binding to calcium ions, which are essential cofactors in the blood coagulation cascade, thereby preventing the blood from clotting. These tubes are primarily used for hematology tests, such as complete blood counts (CBC), where whole blood is required and cell morphology must be preserved.

Question 15: Which culture media are commonly used to cultivate different species of Mycobacterium?

Thayer-Martin agar and Lowenstein-Jensen agar
Cefalotin-buffered dextrin broth and Middlebrook agar
Lowenstein-Jensen and Middlebrook agar (Correct answer)
Buffered Charcoal Yeast Extract and MacConkey Sorbitol agar

Correct answer: Lowenstein-Jensen and Middlebrook agar

Lowenstein-Jensen (LJ) agar and Middlebrook agar are specialized culture media specifically formulated for the isolation and growth of Mycobacterium species, including Mycobacterium tuberculosis. LJ agar is an egg-based medium that inhibits other bacteria, while Middlebrook agars (e.g., 7H10, 7H11) are synthetic agar-based media. Both provide the necessary nutrients and conditions for the slow-growing mycobacteria to thrive, making them essential for diagnosing mycobacterial infections.

Question 16: In tissue, what staining method can be used to identify Aspergillus fumigatus?

Grocott's silver stain (Correct answer)
Immunohistochemistry
potassium hydroxide staining
Calcoflour

Correct answer: Grocott's silver stain

Grocott's Methenamine Silver (GMS) stain is a widely used histopathological stain for visualizing fungi, including Aspergillus species, in tissue sections. The GMS stain highlights fungal cell walls in black or dark brown, making them clearly visible against a light background. This allows for the identification of fungal elements like hyphae and conidia, which are characteristic of Aspergillus infections in tissue.

Question 17: Since hyphae exhibit _____ between the yeast cell and the hyphae or pseudohyphae, they can be identified from germ tubes.

hypha
buds
constriction or septa (Correct answer)
dilation

Correct answer: constriction or septa

Germ tubes are true outgrowths of yeast cells, typically observed in Candida albicans, and are characterized by a lack of constriction at their base where they emerge from the parent cell. In contrast, true hyphae or pseudohyphae exhibit a visible constriction or septa (cross-walls) at the point of budding from the yeast cell or other hyphal segments. This morphological difference is a key diagnostic feature for distinguishing C. albicans germ tubes.

Question 18: What proportion of red blood cells, white blood cells, and platelets make up the total volume of blood?

45% (Correct answer)
75%
95%
25%

Correct answer: 45%

Hemolysis refers to the breakdown or rupture of red blood cells (erythrocytes), which releases hemoglobin into the surrounding plasma or serum. This can occur due to improper blood collection techniques, vigorous shaking of the sample, or certain medical conditions. Hemolysis can interfere with laboratory test results, making the sample unsuitable for analysis.

Question 19: What is the purpose of an antibiotic susceptibility test?

To count bacteria in a specimen
To determine which antibiotics will effectively inhibit or kill the pathogen (Correct answer)
To identify the species of bacteria
To detect viral infections

Correct answer: To determine which antibiotics will effectively inhibit or kill the pathogen

AST determines the minimum inhibitory concentration (MIC) of antibiotics against a bacterial isolate, guiding treatment selection.

Question 20: What classification is given to flames containing materials like paper, plastic, and cloth that are typically combustible?

Class A (Correct answer)
Class C
Class F
Class B

Correct answer: Class A

Class A fires involve ordinary combustible materials such as wood, paper, cloth, rubber, and many plastics. These fires are typically extinguished by cooling the fuel with water or by using dry chemical extinguishers. Understanding fire classifications is crucial for selecting the appropriate extinguishing agent and ensuring safety.

Question 21: An unconscious patient without an armband needs blood drawn. What should the phlebotomist do?

Draw blood and label later
Draw using room number as identification
Have a nurse confirm identity and apply an emergency ID band before drawing (Correct answer)
Refuse to draw without supervisor

Correct answer: Have a nurse confirm identity and apply an emergency ID band before drawing

For unidentified or unconscious patients, a nurse must confirm identity and an emergency ID band must be applied before collection.

Question 22: When antecubital veins are not accessible for venipuncture in an adult, the recommended alternative site is:

Femoral vein in the groin
External jugular vein in the neck
Foot veins (without a physician order)
Hand veins on the dorsal surface (Correct answer)

Correct answer: Hand veins on the dorsal surface

Hand veins on the dorsal surface are the standard alternative venipuncture site when antecubital veins are inaccessible in adult patients.

Question 23: What sort of isolation is frequently used for patients who have intravenous devices, catheters that are infected, and surgical wounds?

complete isolation
dermic isolation
wound and skin isolation (Correct answer)
respiratory isolation

Correct answer: wound and skin isolation

Wound and skin isolation, also known as contact precautions, is implemented for patients with infections that can be transmitted through direct contact with skin, wounds, or contaminated items. This includes patients with infected intravenous devices, infected catheters, or surgical wounds, as these can harbor pathogens like MRSA or VRE. PPE such as gloves and gowns are essential.

Question 24: Which of the following best describes a mutation involving base substitution? AGTCGA is the initial DNA sequence.

ATCGA
AGTAGA (Correct answer)
ATGTCGA
None of these represent a base substitution mutation.

Correct answer: AGTAGA

A base substitution mutation involves the replacement of one nucleotide base with another within a DNA sequence. The original sequence is AGTCGA. In the option AGTAGA, the 'C' at the fourth position has been replaced by a 'T', while the overall length of the sequence remains unchanged. This is a clear example of a base substitution mutation.

Question 25: What kind of anticoagulant is contained in a tube with a light-blue stopper?

sodium citrate (Correct answer)
fluoride
heparin
thymol

Correct answer: sodium citrate

Light-blue stopper tubes contain sodium citrate, which acts as an anticoagulant by binding to calcium ions, essential for the clotting cascade. These tubes are specifically used for coagulation studies, such as Prothrombin Time (PT) and Activated Partial Thromboplastin Time (APTT), because the sodium citrate preserves the clotting factors accurately. The specific concentration of sodium citrate is crucial for these tests.

Question 26: What is the procedure for keeping a specimen under control from the time it is collected until the testing is finished?

None of the above.
Specimen tracking.
Chain of custody. (Correct answer)
Patient control.

Correct answer: Chain of custody.

Chain of custody is the formal procedure for recording and monitoring the transfer of specimens from the point of collection till testing is finished. Written records that trace the movement of the specimen from patient to analyzer, then to storage and/or disposal, serve as documentation. Chain of custody policy should be followed for any tests that have medical or legal relevance, such as paternity tests, blood alcohol tests, and drug tests.

Question 27: The time of collection on a specimen label is MOST critical for which type of test?

Timed specimens such as cortisol or therapeutic drug levels (Correct answer)
Basic metabolic panel
Complete blood count
Routine urinalysis

Correct answer: Timed specimens such as cortisol or therapeutic drug levels

Timed specimens require accurate collection times because results are interpreted based on when the sample was drawn.

Question 28: What is the function of the centrifuge in specimen processing?

To mix reagents with patient specimens
To heat specimens for culture growth
To separate blood components by density using centrifugal force (Correct answer)
To sterilize specimens before testing

Correct answer: To separate blood components by density using centrifugal force

A centrifuge uses centrifugal force to separate blood into layers based on density.

Question 29: When is hand washing not required of healthcare personnel?

whenever there is visible contamination
before initial patient contact
when arriving at work (Correct answer)
before leaving the laboratory

Correct answer: when arriving at work

Hand washing is a critical infection control measure required before and after patient contact, after removing gloves, after contact with body fluids, before leaving the laboratory, and whenever hands are visibly soiled. While good hygiene is always encouraged, there is no specific requirement for healthcare personnel to wash their hands immediately upon *arriving* at work, unless they have visible contamination or are about to engage in patient care.

Question 30: Which antecubital vein carries the HIGHEST risk for nerve and arterial injury during venipuncture?

Cephalic vein
Accessory cephalic vein
Median cubital vein
Basilic vein (Correct answer)

Correct answer: Basilic vein

The basilic vein is located near the median cutaneous nerve and brachial artery, making it the highest-risk antecubital site.

Question 31: What is the recommended method to increase blood flow to a site before capillary puncture?

Apply a tourniquet to the wrist
Apply alcohol and allow it to air dry for 30 seconds only
Warm the site to approximately 42°C for 3 to 5 minutes (Correct answer)
Have the patient hold their breath

Correct answer: Warm the site to approximately 42°C for 3 to 5 minutes

Warming the site to 42°C for 3 to 5 minutes causes vasodilation and increases arterial blood flow into the capillary bed.

Question 32: Which of the following examinations could be combined to evaluate anomalies in clotting?

PT and PTT (Correct answer)
ACT and PPT
PPT and APPT
PT and APPT

Correct answer: PT and PTT

Prothrombin Time (PT) and Partial Thromboplastin Time (PTT, often referred to as aPTT or Activated Partial Thromboplastin Time) are the two primary screening tests used to evaluate the extrinsic and intrinsic pathways of the coagulation cascade, respectively. Performing both tests together provides a comprehensive assessment of a patient's clotting ability and helps identify specific clotting factor deficiencies or excesses.

Question 33: What does the term 'hemolysis' refer to in phlebotomy?

Inflammation of a blood vessel
Formation of a blood clot in a vein
Collapse of a vein during blood draw
Destruction of red blood cells releasing hemoglobin (Correct answer)

Correct answer: Destruction of red blood cells releasing hemoglobin

Hemolysis is the rupture or destruction of red blood cells, releasing hemoglobin into the serum or plasma, which can interfere with many laboratory test results.

Question 34: What is the correct order of draw when using evacuated tube collection?

Gray, lavender, green, blue
Lavender, green, red, blue
Blue, red, green, lavender, gray (Correct answer)
Red, green, lavender, blue

Correct answer: Blue, red, green, lavender, gray

The correct order of draw for evacuated tubes is crucial to prevent additive carryover between tubes, which could contaminate specimens and alter test results. The standard order is: blood culture (sterile), light blue (sodium citrate), red/gold/tiger top (serum), green (heparin), lavender (EDTA), and gray (fluoride/oxalate). This sequence minimizes interference with laboratory tests.

Question 35: What should you do if you realize that a patient's name is spelled differently on the requisition and the patient's armband?

Any of the above.
Visit with your manager to verify the information and have it corrected. (Correct answer)
Assume there was a typo and ignore the requisition.
Ask the patient to go get the requisition corrected.

Correct answer: Visit with your manager to verify the information and have it corrected.

Patient identification is paramount in healthcare. If there is any discrepancy between a patient's name on the requisition and their armband, the phlebotomist must not proceed with the draw. The correct action is to immediately report the discrepancy to a manager or nursing staff to verify the patient's identity and have the information corrected, preventing potential medical errors.

Question 36: It has been recommended to Lacey by her doctor that she up her calcium intake. Which of these is a healthy food for her to eat?

processed proteins and carbohydrates
Natural fats and fruits
Legumes and dark green vegetables (Correct answer)
Meats and meals high in fiber

Correct answer: Legumes and dark green vegetables

Legumes, such as beans and lentils, and dark green leafy vegetables, including spinach, kale, and collard greens, are excellent natural sources of dietary calcium. These foods provide essential minerals and vitamins, contributing significantly to bone health and overall calcium intake. Incorporating them into the diet is a healthy way to increase calcium consumption.

Question 37: Which action should be avoided when collecting a capillary blood specimen?

Warming the puncture site beforehand
Making the puncture perpendicular to fingerprint lines
Squeezing or milking the site excessively (Correct answer)
Wiping away the first drop of blood

Correct answer: Squeezing or milking the site excessively

Excessive squeezing dilutes the specimen with tissue fluid and can cause hemolysis, leading to erroneous test results.

Question 38: Which organization establishes the standards for phlebotomy procedures and order of draw?

FDA
CLSI (Correct answer)
OSHA
CLIA

Correct answer: CLSI

CLSI (Clinical and Laboratory Standards Institute) develops voluntary consensus standards for laboratory procedures, including the order of draw and venipuncture techniques.

Question 39: What would be the best way to get a patient's implied consent before taking their blood?

All of the above.
The patient verifies their identity.
The patient signs a consent form.
The patient extends their arm. (Correct answer)

Correct answer: The patient extends their arm.

When an adult patient extends their arm for venipuncture, it suggests permission. It is stated consent, not implicit consent, if they sign a permission form. Although it is a vital component of any procedure, the patient's action of confirming their identity is unrelated to permission.

Question 40: Which collection device is most appropriate for a pediatric patient requiring a small blood volume from a hand vein?

Winged infusion set (butterfly) with 23-gauge needle (Correct answer)
Syringe with 18-gauge needle
Standard evacuated tube system with 21-gauge needle
Capillary tube with lancet

Correct answer: Winged infusion set (butterfly) with 23-gauge needle

A winged infusion (butterfly) set with a 23-gauge needle is ideal for small or fragile veins such as those in the hand of a pediatric patient.

Question 41: Which of the following is an example of a pre-analytical error?

Reagent expiration causing false results
Instrument calibration failure
Collecting a specimen from the wrong patient (Correct answer)
Performing the incorrect test due to instrument error

Correct answer: Collecting a specimen from the wrong patient

Pre-analytical errors occur before testing and include patient misidentification, improper collection technique, and mislabeling.

Question 42: Which of the following is the most typical reason for blood culture contamination?

Improper storage.
Improper transportation.
Improper site preparation. (Correct answer)
All of the above.

Correct answer: Improper site preparation.

Improper site preparation is the most common reason for blood culture contamination. If the venipuncture site is not meticulously cleaned and disinfected according to protocol, bacteria from the patient's skin can be introduced into the blood culture bottles. This leads to false-positive results, potentially causing unnecessary antibiotic treatment and delaying proper diagnosis.

Question 43: What is the most important step in ensuring accurate patient identification before venipuncture?

Checking the color of the wristband
Asking the patient to state their full name and date of birth (Correct answer)
Looking at the room number
Asking the patient to state their diagnosis

Correct answer: Asking the patient to state their full name and date of birth

The most critical step for accurate patient identification before venipuncture is to ask the patient to verbally state their full name and date of birth. This two-factor authentication method directly involves the patient and helps prevent misidentification, ensuring the correct tests are performed on the correct individual. This is a fundamental safety practice in phlebotomy.

Question 44: What should a phlebotomist do if a patient begins to faint during a blood draw?

Remove the tourniquet and needle immediately and lower the patient's head (Correct answer)
Ask the patient to take deep breaths and continue drawing
Complete the draw quickly and then attend to the patient
Call a code blue immediately

Correct answer: Remove the tourniquet and needle immediately and lower the patient's head

If a patient shows signs of fainting, the phlebotomist must immediately discontinue the draw by removing the tourniquet and needle, apply pressure, and lower the patient's head.

Question 45: A laboratory receives a lavender-topped tube with visible clots. What should the technician do?

Run the specimen as usual
Mix the tube to dissolve the clots
Centrifuge to separate the clots
Reject the specimen and request a recollection (Correct answer)

Correct answer: Reject the specimen and request a recollection

A clotted specimen in an anticoagulated tube must be rejected because clots consume platelets and trap cells, producing inaccurate results.

Question 46: A phlebotomist accidentally draws a green-topped tube before a light blue-topped tube. What should be done?

Switch the labels between the two tubes
Continue with the remaining draw and submit all tubes
Note the order error on the requisition and submit anyway
Discard the light blue tube and redraw it using a new venipuncture (Correct answer)

Correct answer: Discard the light blue tube and redraw it using a new venipuncture

If the order of draw is not followed and a coagulation tube may be contaminated with heparin carry-over, the light blue tube must be discarded and a new one drawn from a fresh venipuncture.

Question 47: Which electrolyte abnormality is most immediately life-threatening and can cause cardiac arrest?

Hyperchloremia
Hyponatremia
Hyperkalemia (Correct answer)
Hypocalcemia

Correct answer: Hyperkalemia

Hyperkalemia (elevated potassium) can cause fatal cardiac arrhythmias and cardiac arrest.

Question 48: Which tube additive works by activating clot formation rather than preventing it?

Clot activator (silica particles) (Correct answer)
Sodium citrate
EDTA
Sodium heparin

Correct answer: Clot activator (silica particles)

Clot activators such as silica or glass particles are coated on the inner walls of red/gold-topped tubes to promote and accelerate clot formation for serum testing.

Question 49: Which immunoassay technique uses enzyme-labeled antibodies and produces a color change proportional to the analyte concentration?

Radioimmunoassay (RIA)
Nephelometry
Electrophoresis
ELISA (Correct answer)

Correct answer: ELISA

ELISA uses enzyme-labeled antibodies that react with a chromogenic substrate to produce a measurable color change.

Question 50: Which color tubes have coagulants in them?

light blue, red, gold
gold, green, lavender
grey, gold, red
gold, red, orange (Correct answer)

Correct answer: gold, red, orange

Dark blue top tubes are specifically designed for trace metal analysis. These tubes are manufactured with very low levels of trace element contamination in their stoppers and glass. This stringent manufacturing process ensures accurate results for sensitive tests like lead, zinc, or copper levels, preventing external contamination from affecting the sample.

Question 51: If psychoactive substance Y is used, it has the potential to change one's mind. Y is typically a volatile chemical that has odd side effects, such as excitement, disorientation, hallucinations, and delusions. One typical illustration of Y is paint thinner. Determine Y.

A narcotic
An inhalant (Correct answer)
An opiate
A cannabis drug

Correct answer: An inhalant

The description of psychoactive substance Y as a volatile chemical causing excitement, disorientation, hallucinations, and delusions, with paint thinner as an example, strongly points to an inhalant. Inhalants are common household products that produce mind-altering effects when sniffed or huffed, often causing immediate and dangerous neurological impacts due to their rapid absorption.

Question 52: Pre-labeled tubes prepared before entering a patient's room are considered:

Acceptable if the patient is well known to staff
Required by CLSI for efficiency
Acceptable for routine daily draws
A patient safety violation (Correct answer)

Correct answer: A patient safety violation

Pre-labeling tubes is a patient safety violation because they could be applied to the wrong patient during a mix-up.

Question 53: What is the principle behind polymerase chain reaction (PCR)?

Measuring antibody-antigen reactions
Amplifying specific DNA sequences through repeated cycles of denaturation, annealing, and extension (Correct answer)
Separating proteins by size
Culturing bacteria in specialized media

Correct answer: Amplifying specific DNA sequences through repeated cycles of denaturation, annealing, and extension

PCR amplifies specific DNA sequences exponentially through thermal cycling: denaturation, annealing, and extension.

Question 54: Which of the following are contained in tubes with a lavender stopper?

sodium citrate
sodium heparin
SST
EDTA (Correct answer)

Correct answer: EDTA

Petechiae are tiny, pinpoint, round spots that appear on the skin as a result of small hemorrhages (bleeding) under the skin. They are typically red or purple and do not blanch when pressed. They can be caused by various factors, including capillary fragility or prolonged tourniquet application, and indicate minor bleeding from capillaries.

Question 55: What shade of tube should be used when taking a sample to check blood alcohol levels?

Royal Blue.
Red.
Yellow.
Gray. (Correct answer)

Correct answer: Gray.

Gray-top tubes are used for blood alcohol levels because they contain sodium fluoride, which acts as an antiglycolytic agent. Sodium fluoride prevents glucose metabolism by red blood cells, ensuring that the alcohol concentration remains stable and accurate over time. These tubes also typically contain potassium oxalate as an anticoagulant.

Question 56: In order to do a STAT glucose test, you are drawing blood. Which tube from the list below is the best option?

a tube with a red stopper
an STAT tube
an SST tube
a tube with a gray stopper (Correct answer)

Correct answer: a tube with a gray stopper

Gray-stopper tubes contain sodium fluoride and potassium oxalate (or sometimes just sodium fluoride and thymol). Sodium fluoride is an antiglycolytic agent that prevents glucose breakdown by blood cells, ensuring accurate glucose levels, especially for STAT (immediate) tests where rapid processing might not be possible. This makes it the best choice for preserving glucose for urgent analysis.

Question 57: What is the minimum number of patient identifiers required before blood collection according to CLSI standards?

Two (Correct answer)
One
Three
Four

Correct answer: Two

CLSI standards require at least two patient identifiers before specimen collection to ensure patient safety.

Question 58: Which of the following is an acceptable patient identifier for venipuncture?

Floor number
Room number
Patient date of birth (Correct answer)
Bed number

Correct answer: Patient date of birth

Date of birth is an acceptable identifier; room, bed, and floor numbers are location-based and not acceptable.

Question 59: Which of these statements about a patient's likelihood of developing metabolic acidosis or alkalosis is often true if they are removing a lot of waste from their body?

Vomiting can result in metabolic alkalosis, whereas excessive urination can result in metabolic acidosis.
Vomiting can result in metabolic acidosis, while excessive urination can result in metabolic alkalosis.
Diarrhea can result in metabolic alkalosis, while vomiting might generate metabolic acidosis.
Vomiting can induce metabolic alkalosis, whereas diarrhea can induce metabolic acidosis. (Correct answer)

Correct answer: Vomiting can induce metabolic alkalosis, whereas diarrhea can induce metabolic acidosis.

Excessive vomiting leads to the loss of stomach acid (hydrochloric acid), which contains hydrogen ions, resulting in an increase in blood pH and metabolic alkalosis. Conversely, severe diarrhea causes a significant loss of bicarbonate from the intestines, leading to a decrease in blood pH and metabolic acidosis. Therefore, these conditions have opposite effects on acid-base balance.

Question 60: Which of the following describes a cutaneous contaminant that originates in the gastrointestinal tract?

Brevibacterium casei
Propionibacterium acnes
Pasteurella multocida
Klebsiella oxytoca (Correct answer)

Correct answer: Klebsiella oxytoca

Klebsiella oxytoca is a Gram-negative bacterium commonly found as a commensal in the human gastrointestinal tract. While part of the normal flora, it is also an opportunistic pathogen capable of causing various infections, including skin and soft tissue infections. Therefore, it can act as a cutaneous contaminant that originates from the gastrointestinal tract, especially in healthcare settings or immunocompromised individuals.

Question 61: Which test result most closely matches the definition of metabolic alkalosis?

High pH, low PaCO2, high bicarbonate
High pH, high PaCO2, high bicarbonate (Correct answer)
Low pH, high PaCO2, high bicarbonate
High PH, high PaCO2, low bicarbonate

Correct answer: High pH, high PaCO2, high bicarbonate

Metabolic alkalosis is characterized by an elevated blood pH (alkalemia) due to an excess of bicarbonate (HCO3-) in the body. The body attempts to compensate for this alkalosis by hypoventilation, which leads to an increase in the partial pressure of carbon dioxide (PaCO2) in the blood. Thus, the test results would show high pH, high PaCO2, and high bicarbonate.

Question 62: What is the purpose of discarding the first drop of blood during capillary collection?

It may be contaminated with tissue fluid that can cause erroneous results (Correct answer)
It contains excess anticoagulant from the lancet
It is required only for glucose testing per CLSI standards
It reduces the risk of hemolysis in subsequent drops

Correct answer: It may be contaminated with tissue fluid that can cause erroneous results

The first drop may be diluted with tissue fluid released during the puncture, which can affect test results.

Question 63: Why should blood cultures be drawn first when performing multiple tests?

They are time-sensitive
To avoid contamination from other tubes (Correct answer)
They require the most blood
To ensure platelet levels are preserved

Correct answer: To avoid contamination from other tubes

Drawing blood cultures first prevents contamination from additives in other tubes, which could compromise test results.

Question 64: Which laboratory department is responsible for performing complete blood counts (CBC)?

Urinalysis
Microbiology
Chemistry
Hematology (Correct answer)

Correct answer: Hematology

The hematology department analyzes blood cell counts, differentials, hemoglobin, hematocrit, and blood cell morphology.

Question 65: Which analyte is MOST significantly affected by hemolysis, producing a falsely elevated result?

Potassium (Correct answer)
Sodium
Chloride
Creatinine

Correct answer: Potassium

Hemolysis releases intracellular potassium from red blood cells into the serum, falsely elevating potassium levels.

Question 66: Which specimen handling error would falsely elevate serum potassium results?

Hemolysis of the specimen (Correct answer)
Exposing the specimen to light
Refrigerating the specimen
Using the wrong anticoagulant tube

Correct answer: Hemolysis of the specimen

Hemolysis releases intracellular potassium from red blood cells, which contain about 23 times more potassium than plasma.

Question 67: What other name would you give a thrombocyte?

Thrombus.
Plasma.
White blood cell.
Platelet. (Correct answer)

Correct answer: Platelet.

A thrombocyte is also known as a platelet. They are the microscopic blood cells that assist in the formation of clots by your body to halt bleeding. A thrombus is another name for a clot.

Question 68: A hematoma begins forming during venipuncture. The phlebotomist should FIRST:

Remove the needle and apply firm pressure immediately (Correct answer)
Apply a tourniquet above the hematoma
Continue the draw as quickly as possible
Massage the area to disperse the blood

Correct answer: Remove the needle and apply firm pressure immediately

When a hematoma forms, the needle must be removed immediately and firm pressure applied to stop blood from leaking into surrounding tissue.

Question 69: Preanalytical mistakes may happen:

when adjusting apparatus
when examining a sample in a laboratory
When recording the identification of a patient
with a sample before doing laboratory tests (Correct answer)

Correct answer: with a sample before doing laboratory tests

Preanalytical errors occur during the stages *before* the sample is actually tested in the laboratory. This includes patient preparation, sample collection, labeling, transport, and processing. These errors are the most common type of laboratory error and can significantly impact the accuracy and reliability of test results.

Question 70: What are the written and spoken protocols for infectious disease exposure recommended by OSHA called?

universal precautions (Correct answer)
infection control program
quality assurance
10-step process

Correct answer: universal precautions

Universal Precautions are an infection control strategy developed by OSHA that mandates treating all human blood and certain body fluids as if they are known to be infectious for HIV, HBV, and other bloodborne pathogens. These protocols include specific guidelines for personal protective equipment (PPE), safe handling of sharps, and proper disposal of contaminated materials to protect healthcare workers from exposure.

Question 71: What term describes being free from pollution or germs?

Clean.
Healthy.
Sepsis.
Asepsis. (Correct answer)

Correct answer: Asepsis.

Being devoid of contamination or germs that could spread disease is known as asepsis. Humans are said to be healthy when they are free of a recognized condition. Asepsis' opposite, sepsis, denotes something that is polluted or infected with bacteria. Clean is a broad phrase that may or may not refer to an aseptic object.

Question 72: A phlebotomist is asked to collect blood from a patient who speaks a different language. What is the most appropriate action?

Use hand gestures to explain the procedure and proceed
Ask a family member in the room to translate
Skip the draw and document the language barrier
Request a certified medical interpreter (Correct answer)

Correct answer: Request a certified medical interpreter

Using a certified medical interpreter ensures accurate communication, proper informed consent, and compliance with patient rights regulations.

Question 73: What is FISH (fluorescence in situ hybridization) used for?

Measuring body fluid pH
Growing fluorescent bacteria
Detecting specific DNA/RNA sequences in cells using fluorescent-labeled probes (Correct answer)
Performing automated blood counts

Correct answer: Detecting specific DNA/RNA sequences in cells using fluorescent-labeled probes

FISH uses fluorescent-labeled DNA probes that hybridize to specific chromosome regions, enabling visualization of chromosomal abnormalities.

Question 74: When performing trace metal analysis, which color tube would you use?

yellow
green
dark blue (Correct answer)
orange

Correct answer: dark blue

The cephalic vein is frequently utilized for venipuncture in obese patients because it tends to be more superficial and palpable on the outer aspect of the arm. In contrast, the median cubital and basilic veins can be deeper and more challenging to locate due to increased adipose tissue. Its accessibility makes it a reliable choice in these situations.

Question 75: A eukaryotic cell lacks spliceosomes by nature. The gene products that resulted would probably:

Undergo alternative splicing
Be unaffected by the lack of spliceosomes
Have an abundance of exons
Have an abundance of introns (Correct answer)

Correct answer: Have an abundance of introns

In eukaryotic cells, spliceosomes are crucial complexes responsible for RNA splicing, the process of removing non-coding intron sequences from pre-mRNA and ligating the coding exon sequences together. If a eukaryotic cell lacks functional spliceosomes, introns would not be removed from the pre-mRNA. This would result in mature mRNA transcripts that retain an abundance of introns, likely leading to non-functional or altered proteins.

Question 76: What kind of horizontal gene transfer is the foundation for the process known as electroporation, which enables cells to absorb large molecules like DNA?

Transformation (Correct answer)
Binary fission
Transduction
Conjugation

Correct answer: Transformation

Electroporation is a laboratory technique that uses an electrical pulse to create temporary pores in cell membranes, allowing large molecules like DNA to enter the cell. This process is a form of artificial transformation, which is a type of horizontal gene transfer where a cell takes up naked DNA from its environment. Therefore, electroporation fundamentally relies on the principle of transformation to introduce foreign DNA into cells.

Question 77: Which kind of domination is exemplified by the blood type of humans?

Incomplete dominance
Complete dominance
Codominance (Correct answer)
Sex-linked dominance

Correct answer: Codominance

Human ABO blood types are a classic example of codominance. In individuals with the AB blood type, both the A and B alleles are fully and equally expressed, resulting in the presence of both A and B antigens on the surface of red blood cells. Neither allele masks the other, which is the defining characteristic of codominance.

Question 78: What specimen type is required for a lipid panel, and what patient preparation is recommended?

Capillary blood after 4 hours fasting
Plasma in a green tube, non-fasting
Whole blood in a lavender tube, no fasting
Serum in a red or gold tube after 9-12 hours fasting (Correct answer)

Correct answer: Serum in a red or gold tube after 9-12 hours fasting

A lipid panel traditionally requires serum collected after 9-12 hours fasting for accurate triglyceride levels.

Question 79: What kind of material ought to be thrown away in a biohazard bag?

All of these (Correct answer)
lancets
needles
capillary tubes

Correct answer: All of these

Needles, lancets, and capillary tubes are all considered contaminated sharps or potentially infectious waste after use. They must be disposed of in designated puncture-resistant sharps containers, which are then typically placed into biohazard bags or containers for proper disposal according to biohazard waste regulations. This prevents needlestick injuries and the spread of infectious agents.

Question 80: What should be added to a sample if it needs to be diluted?

Diluent. (Correct answer)
Anticoagulant.
Preservative.
All of the above.

Correct answer: Diluent.

A diluent is a substance, typically a liquid, used to reduce the concentration of a solution or suspension. When a blood sample needs to be diluted for specific laboratory tests, a precise amount of diluent is added to achieve the correct concentration for accurate analysis. Preservatives and anticoagulants serve different functions related to sample integrity.

ASCP Phlebotomy Technician (PBT) Certification Exam

The ASCP PBT exam certifies individuals as competent phlebotomy technicians, demonstrating their knowledge and skills in venipuncture, specimen collection, and processing.

Questions

120 min

Time Limit

400%

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