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

Question 1: Which organization establishes the standards for phlebotomy procedures and order of draw?

CLSI (Correct answer)
FDA
CLIA
OSHA

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 2: Which tube stopper color contains sodium citrate as the anticoagulant and is primarily used for coagulation studies?

Light blue (Correct answer)
Lavender
Green
Red

Correct answer: Light blue

Light blue-topped tubes contain sodium citrate (3.2%) and are the standard tubes for coagulation testing such as PT and aPTT.

Question 3: During a multi-tube draw, a phlebotomist draws a lavender top tube before a light blue top tube. What is the most likely consequence of this error?

The clotting time in the light blue tube may be falsely prolonged. (Correct answer)
The glucose level in the light blue tube will be falsely elevated.
The potassium level in the light blue tube will be falsely decreased.
The red blood cell count in the lavender tube will be inaccurate.

Correct answer: The clotting time in the light blue tube may be falsely prolonged.

The additive in the lavender tube is EDTA, which binds calcium. The light blue tube is used for coagulation studies (like PT/PTT) which depend on calcium. If EDTA from the lavender tube contaminates the light blue tube, it will bind the calcium in the sample, leading to artificially prolonged clotting times.

Question 4: A therapeutic drug monitoring specimen should be collected:

Immediately after the drug is administered
At any convenient time during the dosing interval
At the peak or trough level as specified by the physician's order (Correct answer)
Only before the very first dose is given

Correct answer: At the peak or trough level as specified by the physician's order

Drug monitoring requires collection at the prescribed time (peak or trough) because reference ranges are time-dependent.

Question 5: Why should blood cultures be drawn first when performing multiple tests?

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

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

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

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 7: What is the purpose of blood agar in microbiology?

To selectively grow only gram-negative bacteria
To detect hemolysis patterns that help identify bacterial species (Correct answer)
To test antibiotic susceptibility
To inhibit fungal growth

Correct answer: To detect hemolysis patterns that help identify bacterial species

Blood agar detects hemolysis patterns (alpha, beta, gamma) produced by bacteria, aiding identification.

Question 8: What sort of isolation is frequently used for patients who have intravenous devices, catheters that are infected, and surgical wounds?

wound and skin isolation (Correct answer)
respiratory isolation
complete isolation
dermic 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 9: Which of the following claims about the norm for infection control precautions is untrue?

hands should be washed before putting on and after removing gloves
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

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's aspirated joint fluid following a recent arthroplasty was placed on a blood agar plate. Under a microscope, gram-positive cocci were found. The colonies were alpha hemolytic following a 24-hour incubation period. Which test would be most helpful in determining the infection's cause?

coagulase
mannitol salt agar
catalase test (Correct answer)
oxidase test

Correct answer: catalase test

Given gram-positive cocci that are alpha-hemolytic from a joint fluid sample, common pathogens include Streptococcus pneumoniae and viridans streptococci. The catalase test is crucial for differentiation, as streptococci are catalase-negative, while staphylococci (another group of gram-positive cocci) are catalase-positive. This test helps narrow down the potential causative agent, guiding further identification and treatment.

Question 11: What can happen if alcohol isn't given enough time to thoroughly dry during site preparation?

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

Correct answer: Hemolysis.

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

Question 12: What classification is given to flames containing materials like paper, plastic, and cloth that are typically combustible?

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

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 13: Which liver enzyme is most specific for liver damage?

ALT (alanine aminotransferase) (Correct answer)
Gamma-glutamyl transferase (GGT)
AST (aspartate aminotransferase)
Alkaline phosphatase (ALP)

Correct answer: ALT (alanine aminotransferase)

ALT is the most liver-specific enzyme because it is found predominantly in hepatocytes, unlike AST which is also found in heart, muscle, and kidneys.

Question 14: Why are obsolete evacuated tubes not allowed to be used in quality control procedures?

additives that prevent clotting may no longer work
all of these are true (Correct answer)
specimens collected may yield incorrect results
the tubes may not fill completely

Correct answer: all of these are true

Obsolete or expired evacuated tubes should never be used for specimen collection, even for quality control. Over time, the vacuum can degrade, preventing proper fill volume, and additives (like anticoagulants or gels) can lose their efficacy. This can lead to incorrect blood-to-additive ratios, incomplete clotting or preservation, and ultimately inaccurate test results, compromising patient care.

Question 15: What can happen if a needle is inserted where two veins diverge?

Failed venipuncture.
An increased chance of a hematoma. (Correct answer)
Nothing. This is an ideal spot for venipuncture.
Nerve damage.

Correct answer: An increased chance of a hematoma.

A hematoma is more likely to form when a needle is inserted in an area where veins divide. Insertion must take place in the specified vein's unbroken section.

Question 16: Which needle gauge is MOST appropriate when collecting from a patient with small, fragile veins?

18 gauge
16 gauge
21 gauge
23 gauge (Correct answer)

Correct answer: 23 gauge

A 23-gauge needle has the smallest diameter, producing the least trauma and least likely to collapse or rupture fragile veins.

Question 17: What distinguishing feature sets cytochromes apart?

How many carbons are present in the porphyrin ring
The capacity to move electrons around
The quantity of hemes that the protein is linked to
The groupings of chemicals bound to the heme group (Correct answer)

Correct answer: The groupings of chemicals bound to the heme group

Cytochromes are proteins characterized by a heme prosthetic group, which is a porphyrin ring containing an iron atom. While all cytochromes share this basic structure, their distinguishing feature lies in the specific chemical groups (ligands) that bind to the heme iron and the surrounding protein environment. These variations determine the specific type of cytochrome (a, b, c) and its unique redox potential, crucial for its role in electron transport chains.

Question 18: Which department is responsible for performing blood typing and crossmatching?

Hematology
Blood bank (immunohematology) (Correct answer)
Microbiology
Chemistry

Correct answer: Blood bank (immunohematology)

The blood bank (immunohematology) department is responsible for blood typing, crossmatching, antibody screening, and ensuring compatible blood products for transfusion.

Question 19: Which laboratory department is responsible for performing complete blood counts (CBC)?

Chemistry
Urinalysis
Microbiology
Hematology (Correct answer)

Correct answer: Hematology

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

Question 20: Which antecubital vein carries the HIGHEST risk for nerve and arterial injury during venipuncture?

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

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 21: Which of the following would best identify the presence of metabolites in bodily fluids? Mitochondrial abnormalities can be identified by the presence of metabolites in the bloodstream, urine, or cerebral spinal fluid.

PCR
Western-blot
Mass spectrometry (Correct answer)
In-situ hybridization

Correct answer: Mass spectrometry

Mass spectrometry is a powerful analytical technique used to identify and quantify metabolites in complex biological samples such as blood, urine, or cerebrospinal fluid. For mitochondrial abnormalities, which often involve defects in metabolic pathways, mass spectrometry can detect abnormal levels or patterns of specific metabolites. Its high sensitivity and specificity make it an ideal tool for diagnosing metabolic disorders.

Question 22: Which of the following tasks is not within the phlebotomist's purview of practice?

Labeling samples correctly.
Identifying patients properly.
Collecting a tissue sample. (Correct answer)
Drawing blood using the appropriate equipment.

Correct answer: Collecting a tissue sample.

The duties of a phlebotomist include identifying patients by identification, medical records, and/or verbal confirmation, drawing blood with the use of needles and other standard equipment, and appropriately labeling samples before submitting them for testing. Phlebotomists are not permitted to take tissue samples as part of their work.

Question 23: When is hand washing not required of healthcare personnel?

when arriving at work (Correct answer)
whenever there is visible contamination
before initial patient contact
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 24: Where should a label be placed on a blood culture bottle?

Over the manufacturer's barcode for security
On the bottom of the bottle
On the side of the bottle without covering the manufacturer's barcode (Correct answer)
Only on the aerobic bottle in a set

Correct answer: On the side of the bottle without covering the manufacturer's barcode

Labels must be placed on the side without covering the manufacturer's barcode so that automated scanners can still read the bottle.

Question 25: Which hospital department offers mobility therapy to patients?

physical therapy (Correct answer)
kinesthetics
personal training
respiratory therapy

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 26: What is the difference between real-time PCR (qPCR) and conventional PCR?

Conventional PCR uses higher temperatures
No significant difference
qPCR monitors amplification in real-time using fluorescent probes, enabling quantification (Correct answer)
qPCR is faster but less accurate

Correct answer: qPCR monitors amplification in real-time using fluorescent probes, enabling quantification

Real-time PCR uses fluorescent reporters to monitor amplification during each cycle, enabling quantification of starting template.

Question 27: What would be the best way to get a patient's implied consent before taking their blood?

The patient signs a consent form.
All of the above.
The patient verifies their identity.
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 28: Which information is NOT required on a specimen label?

Date and time of collection
Patient's insurance number (Correct answer)
Phlebotomist's initials
Patient's full name

Correct answer: Patient's insurance number

Required label information includes patient name, ID number, date/time, and collector's initials — insurance number is not required.

Question 29: What does CLIA '88 regulate in clinical laboratories?

Staffing levels and work schedules
Quality standards for laboratory testing on human specimens (Correct answer)
Drug pricing and availability
Building codes for laboratory construction

Correct answer: Quality standards for laboratory testing on human specimens

CLIA '88 establishes quality standards for all clinical laboratory testing performed on human specimens.

Question 30: What additive is found in yellow-topped blood culture tubes?

Sodium fluoride
EDTA
Sodium polyanethol sulfonate (SPS) (Correct answer)
Lithium heparin

Correct answer: Sodium polyanethol sulfonate (SPS)

Yellow-topped blood culture tubes contain SPS, an anticoagulant that also inhibits complement, phagocytes, and certain antibiotics, creating an optimal environment for bacterial growth.

Question 31: The average amount of blood in an adult human being is how many liters?

10 liters.
2 liters.
5 liters. (Correct answer)
3 liters.

Correct answer: 5 liters.

Blood is stored in the human body in amounts of 5-5.5 liters. Depending on the person's size, this might change.

Question 32: Which microscopic finding on a peripheral blood smear indicates iron deficiency anemia?

Large, oval macrocytes
Target cells with bull's-eye pattern
Sickle-shaped cells
Hypochromic, microcytic red blood cells (Correct answer)

Correct answer: Hypochromic, microcytic red blood cells

Iron deficiency anemia shows hypochromic (pale) microcytic (small) red blood cells because insufficient iron leads to decreased hemoglobin synthesis.

Question 33: Which technique can assist in identifying a poisonous drug present in a person's bloodstream?

Western blotting
PCR
Mass spectrometry (Correct answer)
Agarose gel electrophoresis

Correct answer: Mass spectrometry

Mass spectrometry is a highly sensitive and specific analytical technique widely employed in toxicology for identifying and quantifying drugs and their metabolites in biological samples, such as blood. It works by ionizing molecules and separating them based on their mass-to-charge ratio, creating a unique 'fingerprint' that allows for the precise identification of unknown substances, including poisonous drugs, in a person's bloodstream.

Question 34: The BEST preventive measure against vasovagal syncope (fainting) during phlebotomy is:

Having the patient lie down or recline before and during collection (Correct answer)
Drawing from the hand vein rather than the antecubital fossa
Applying a cold compress to the forehead before collection
Collecting the specimen as quickly as possible

Correct answer: Having the patient lie down or recline before and during collection

Placing the patient in a reclined or supine position maintains cerebral blood flow and is the most effective prevention for vasovagal syncope.

Question 35: 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 36: What does MRSA stand for, and why is it clinically significant?

Macrolide-resistant Staphylococcus aureus; resistant to erythromycin only
Multi-resistant Streptococcus aureus; causes severe pneumonia
Multi-resistant Salmonella; causes food poisoning
Methicillin-resistant Staphylococcus aureus; resistant to beta-lactam antibiotics (Correct answer)

Correct answer: Methicillin-resistant Staphylococcus aureus; resistant to beta-lactam antibiotics

MRSA carries the mecA gene encoding altered PBP2a that confers resistance to virtually all beta-lactam antibiotics.

Question 37: What does the term 'aliquot' mean in laboratory processing?

A chemical preservative added to specimens
A type of laboratory instrument
A portion of a specimen transferred to a separate container for testing (Correct answer)
The serial number assigned to each specimen

Correct answer: A portion of a specimen transferred to a separate container for testing

An aliquot is a measured portion of a specimen transferred from the primary collection tube into a secondary container.

Question 38: Which of the following is broken down into amino acids by hydrochloric acid and pepsin?

Proteins (Correct answer)
Soluble fiber
None of these answers are correct
Fatty acids

Correct answer: Proteins

In the stomach, hydrochloric acid denatures proteins, causing them to unfold. Pepsin, an enzyme activated by the acidic environment, then begins to break down these denatured proteins into smaller polypeptide chains. This initial enzymatic digestion is a critical step in the overall process of protein digestion, which ultimately yields individual amino acids for absorption.

Question 39: Which division carries out C & S testing?

microbiology (Correct answer)
immunology
chemistry
hematology

Correct answer: microbiology

C & S stands for Culture and Sensitivity testing, which involves identifying pathogenic microorganisms in a specimen and determining their susceptibility to antibiotics. This specialized testing is exclusively carried out by the microbiology division of a laboratory. This department focuses on the detection, identification, and characterization of bacteria, viruses, fungi, and parasites.

Question 40: Which department looks for crystals, germs, and blood cells in specimens under a microscope?

hematology
microbiology
urinalysis (Correct answer)
chemistry

Correct answer: urinalysis

The urinalysis department is responsible for the physical, chemical, and microscopic examination of urine specimens. This includes looking for the presence of crystals, bacteria, red blood cells, white blood cells, and other cellular elements under a microscope to diagnose conditions affecting the kidneys, urinary tract, and other metabolic disorders.

Question 41: The recommended minimum number of blood culture sets collected from separate venipuncture sites is:

Two sets from two separate venipuncture sites (Correct answer)
Three sets from the same site drawn in succession
A single aerobic bottle from one site
One set from one site

Correct answer: Two sets from two separate venipuncture sites

Collecting two sets from two different sites reduces false positives from skin contamination and increases pathogen detection sensitivity.

Question 42: What condition is indicated by a low serum albumin combined with elevated total protein?

Multiple myeloma or chronic inflammatory condition (Correct answer)
Malnutrition
Dehydration
Liver failure only

Correct answer: Multiple myeloma or chronic inflammatory condition

Low albumin with elevated total protein suggests increased immunoglobulin production, as in multiple myeloma or chronic inflammatory conditions.

Question 43: Which of the following describes the epidermis's deepest layer?

Stratum granulosum
Stratum lucidum
Stratum corneum
Stratum basale (Correct answer)

Correct answer: Stratum basale

Orange-top tubes contain thrombin, a powerful and rapid clot activator. Thrombin significantly accelerates the clotting process, allowing for quick serum separation, which is ideal for STAT (short turnaround time) serum chemistry tests. This rapid clotting is crucial when immediate test results are needed for critical patient care decisions.

Question 44: Which kind of domination is exemplified by the blood type of humans?

Codominance (Correct answer)
Sex-linked dominance
Complete dominance
Incomplete 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 45: Why is oxygen necessary for us?

To create ATP, our cells require oxygen. (Correct answer)
Hemoglobin is made by our cells using oxygen.
For our cells to create 2, 3-BPG, oxygen is necessary.
To produce glucose, our cells require oxygen.

Correct answer: To create ATP, our cells require oxygen.

Oxygen is essential for cellular respiration, the metabolic process by which cells generate energy in the form of adenosine triphosphate (ATP). In the mitochondria, oxygen acts as the final electron acceptor in the electron transport chain, a critical step that drives the production of the vast majority of ATP needed for all cellular functions.

Question 46: Which needle gauge is most commonly used for routine adult venipuncture?

27 gauge
18 gauge
21 gauge (Correct answer)
25 gauge

Correct answer: 21 gauge

A 21-gauge needle is standard for routine adult venipuncture, providing an adequate flow rate while minimizing discomfort and hemolysis risk.

Question 47: A phlebotomist is tasked with drawing blood for a STAT chemistry panel. Which color tube, containing which additive, would be most appropriate?

Gray top; Potassium Oxalate
Green top; Heparin (Correct answer)
Light blue top; Sodium Citrate
Red top; No additive

Correct answer: Green top; Heparin

Green top tubes contain heparin (either sodium or lithium), which is an anticoagulant that inhibits thrombin formation. This allows for rapid separation of plasma for STAT chemistry tests, as there is no need to wait for the blood to clot.

Question 48: Which of the following is an acceptable patient identifier for venipuncture?

Room number
Patient date of birth (Correct answer)
Floor number
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 49: Which statement best sums up platelets?

the blood clotting cells (Correct answer)
blood cells that consume fungus and bacteria
the watery, colorless portion of blood
developed cells that supply biological tissues with oxygen

Correct answer: the blood clotting cells

The stratum basale is the deepest layer of the epidermis, resting directly on the basement membrane. This layer contains actively dividing keratinocytes, which continuously produce new skin cells that migrate upwards. It also houses melanocytes, responsible for producing melanin, the pigment that gives skin its color.

Question 50: What is the purpose of an antibiotic susceptibility test?

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

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 51: Hemolysis: What is it?

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

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 52: Which ASCP certification exam covers all areas of the clinical laboratory at the technician level?

CT(ASCP)
MLS(ASCP)
MLT(ASCP) (Correct answer)
PBT(ASCP)

Correct answer: MLT(ASCP)

The MLT(ASCP) certification covers hematology, chemistry, microbiology, blood bank, urinalysis, and immunology at the associate-degree level.

Question 53: A patient spells their name differently than what appears on the requisition. The phlebotomist should:

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

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

Exposing the specimen to light
Hemolysis of the specimen (Correct answer)
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 55: Which glass tube among the following is additive-free?

a tube with a royal blue top
a tube with an orange top
a tube with a dark green top
a tube with a red top (Correct answer)

Correct answer: a tube with a red top

Red-top tubes are typically plain glass tubes that contain no additives, anticoagulants, or gels. They are used to collect serum for various chemistry tests, serology, and blood banking procedures where clotting is desired and no interference from additives is needed. The blood clots naturally, and the serum is then separated.

Question 56: What term describes being free from pollution or germs?

Sepsis.
Healthy.
Clean.
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 57: Which of the following actions may lead to hemolysis of the blood sample?

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

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 58: What are little purple or red dots on the body that result from a small cut?

purpura
petechiae (Correct answer)
ecchymosis
bruises

Correct answer: petechiae

A petechia is a tiny, 1-2 mm purple or red patch on the skin that results from a small blood clot in capillary blood vessels. Physical trauma, such as a severe episode of coughing, holding one's breath, vomiting, or sobbing, is the most frequent cause of petechiae. These events can induce facial petechiae, particularly in the area around the eyes.

Question 59: Which ethical principle requires a phlebotomist to obtain a patient's agreement before performing a blood draw?

Justice
Informed consent (Correct answer)
Nonmaleficence
Beneficence

Correct answer: Informed consent

Informed consent requires that the patient understands and agrees to the procedure before it is performed.

Question 60: 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 61: GTT is an acronym for:

glucose tube tolerance
glucose test tube
glucose tolerance test (Correct answer)
glucose tricyclene test

Correct answer: glucose tolerance test

GTT stands for Glucose Tolerance Test. This diagnostic test measures the body's ability to metabolize glucose and is used to screen for or diagnose diabetes mellitus and gestational diabetes. It involves measuring blood glucose levels at specific intervals after a patient consumes a standardized glucose solution.

Question 62: A laboratory technician receives a specimen without a patient label. What is the correct action?

Process the specimen and note the labeling issue
Label it with information from the requisition form
Reject the specimen and request a recollection (Correct answer)
Call the floor and ask them to confirm the patient verbally

Correct answer: Reject the specimen and request a recollection

An unlabeled specimen must be rejected because there is no way to confirm it belongs to the correct patient.

Question 63: Which area of the heel is recommended for capillary puncture in neonates?

The posterior curvature of the heel
The center of the heel
The dorsal surface of the foot
The medial or lateral plantar surface (Correct answer)

Correct answer: The medial or lateral plantar surface

The medial or lateral plantar surface avoids the calcaneus bone and major nerves and arteries, making it the safe zone for heel sticks.

Question 64: Which group of functional groups is present in sugars all the time?

Amines and alcohols
Hydroxyl qroups (Correct answer)
Ethers and carboxylic acids
Ethers and amines

Correct answer: Hydroxyl qroups

Sugars, also known as carbohydrates, are organic compounds characterized by the presence of multiple hydroxyl (-OH) functional groups. These hydroxyl groups, along with a carbonyl group (either an aldehyde or a ketone), are fundamental to the structure and chemical properties of all sugars. They enable sugars' solubility in water and their crucial roles in biological processes.

Question 65: Hemolysis in a specimen is MOST likely caused by:

Slow blood flow due to a large vein
Performing adequate tube inversions
Forcing blood through a needle that is too small (Correct answer)
Using a needle that is too large

Correct answer: Forcing blood through a needle that is too small

Using a small-gauge needle or forcing blood through it creates shear forces that rupture red blood cells, causing hemolysis.

Question 66: What shade of tube should be used when taking a sample to check blood alcohol levels?

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

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 67: Which of the following is regarded as appropriate approach when cleaning a site before venipuncture?

wipe the venipuncture site in the direction of blood flow
start at the planned venipuncture site and work your way outward in circular motions. (Correct answer)
Cleanse the venipuncture site in the opposite direction of the blood flow.
clean internally in circular motions, completing the procedure at the planned venipuncture site.

Correct answer: start at the planned venipuncture site and work your way outward in circular motions.

This cleaning technique ensures that microorganisms are moved away from the intended puncture site, minimizing the risk of contamination and infection. Starting at the center and moving outwards prevents reintroducing bacteria from the surrounding skin back into the clean area. This aseptic technique is critical for patient safety during venipuncture.

Question 68: What is the maximum recommended puncture depth for a neonate heel stick per CLSI guidelines?

1.5 mm
2.5 mm
2.0 mm (Correct answer)
1.0 mm

Correct answer: 2.0 mm

CLSI guidelines recommend a maximum puncture depth of 2.0 mm for neonatal heel sticks to avoid hitting the calcaneus bone.

Question 69: What component of blood is potassium EDTA able to bind to?

Calcium. (Correct answer)
All of the above.
Iron.
Magnesium.

Correct answer: Calcium.

Potassium EDTA (Ethylenediaminetetraacetic acid) acts as an anticoagulant by binding to calcium ions in the blood. Calcium is a crucial cofactor required for the coagulation cascade, and by chelating (binding) free calcium, EDTA effectively prevents the blood from clotting. This makes EDTA tubes suitable for hematology tests where whole blood is needed.

Question 70: Which of the following describes a cutaneous contaminant that originates in the gastrointestinal tract?

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

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

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

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

needles
All of these (Correct answer)
capillary tubes
lancets

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

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

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

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

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 75: What is the purpose of the rubber sleeve inside an evacuated tube holder?

To make the holder more comfortable to grip
To prevent blood from leaking when changing tubes (Correct answer)
To prevent needle stick injuries
To maintain vacuum in the tube after needle insertion

Correct answer: To prevent blood from leaking when changing tubes

The rubber sleeve in the tube holder covers the internal needle and prevents blood from leaking into the holder when tubes are removed and exchanged during multi-tube collection.

Question 76: What does the delta check in laboratory testing evaluate?

The time elapsed between specimen collection and testing
The comparison of a patient's current result with their previous result (Correct answer)
The difference between two different analytes in the same specimen
The variation between two instruments running the same test

Correct answer: The comparison of a patient's current result with their previous result

A delta check compares a patient's current test result with their most recent previous result to identify clinically significant changes that might indicate a specimen error.

Question 77: What is next-generation sequencing (NGS) and how has it impacted clinical diagnostics?

A faster version of Sanger sequencing
Massively parallel sequencing of millions of DNA fragments simultaneously (Correct answer)
A protein sequencing technique
A method for growing bacteria quickly

Correct answer: Massively parallel sequencing of millions of DNA fragments simultaneously

NGS performs massively parallel sequencing of millions of fragments, enabling comprehensive genomic analysis at unprecedented speed.

Question 78: When using a winged blood collection (butterfly) set, what is the first tube in the order of draw if coagulation tests are ordered?

A discard tube (Correct answer)
Light blue top
Lavender top
Red top

Correct answer: A discard tube

With butterfly sets, a discard tube must be drawn first to fill the dead space in the tubing and prevent short-filling the coagulation tube, which would alter the blood-to-anticoagulant ratio.

Question 79: Which anticoagulant is used in a tube that has a gray stopper?

fluoride and thymol
sodium citrate and thymol
sodium fluoride and thymol (Correct answer)
citrate and thymol

Correct answer: sodium fluoride and thymol

Tubes with a gray stopper are primarily used for glucose testing. Sodium fluoride acts as an antiglycolytic agent, preventing glucose metabolism by red blood cells, thus preserving the glucose concentration in the sample. Thymol is also an antiglycolytic agent, further enhancing the preservation of glucose for accurate measurement.

Question 80: When should specimen labels be applied to collection tubes?

After returning to the laboratory
When test results are finalized
Before entering the patient's room
Immediately after collection at the bedside in the patient's presence (Correct answer)

Correct answer: Immediately after collection at the bedside in the patient's presence

Tubes must be labeled immediately after collection at the bedside in the patient's presence to prevent mislabeling errors.

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%

To Pass

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These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

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