Medical Technologist (MT) / Medical Laboratory Scientist (MLS) ASCP Exam — Questions and Answers

Question 1: A serum sodium of 125 mEq/L with dilute urine in a cancer patient suggests which diagnosis?

SIADH (Correct answer)
Diabetes insipidus
Addison's disease
Hyperaldosteronism

Correct answer: SIADH

SIADH (syndrome of inappropriate ADH) causes hyponatremia with inappropriately concentrated urine, commonly paraneoplastic.

Question 2: Which selective and differential medium is used to isolate Salmonella and Shigella from stool?

Buffered charcoal yeast extract
Blood agar
Columbia CNA agar
Hektoen enteric agar (Correct answer)

Correct answer: Hektoen enteric agar

Hektoen enteric (HE) agar differentiates Salmonella and Shigella from other gram-negatives by inhibiting coliforms and showing characteristic colony colors.

Question 3: How many different medical technologies are there today?

1,000,000
500,000 (Correct answer)
100,000

Correct answer: 500,000

The medical technology sector is incredibly diverse and innovative, constantly developing new products and solutions. Industry estimates and reports often cite hundreds of thousands of distinct medical technologies available on the market globally. The figure of 500,000 reflects the vast breadth and continuous innovation within this field.

Question 4: Which of the following is a condition under which a clinical laboratory license cannot be issued?

Transferring of results of test done in an outside clinical laboratory to the result form of the referring laboratory
Permitting unauthorized personnel to perform technical procedures
Use of expired reagents
All of the above (Correct answer)

Correct answer: All of the above

All the listed conditions are serious violations of clinical laboratory standards and ethical practices. Using expired reagents compromises test accuracy and patient safety, permitting unauthorized personnel to perform technical procedures is illegal and dangerous, and transferring results from an outside lab misrepresents the origin and quality of testing. Any of these actions would be grounds for denying or revoking a clinical laboratory license.

Question 5: Elevated serum amylase and lipase are characteristic of which condition?

Renal failure
Hepatitis
Acute pancreatitis (Correct answer)
Myocardial infarction

Correct answer: Acute pancreatitis

Both amylase and lipase are pancreatic enzymes that rise significantly during acute pancreatitis; lipase is more specific.

Question 6: The term 'leukocytosis' is defined as:

A decrease in white blood cell count below normal
Absence of white blood cells in circulation
An increase in white blood cell count above normal (Correct answer)
Abnormal morphology of white blood cells

Correct answer: An increase in white blood cell count above normal

Leukocytosis refers to a white blood cell count above the upper reference limit, often indicating infection or inflammation.

Question 7: The term 'phlebotomy' refers to:

Transfusion of blood products
Analysis of blood cell morphology
The act of drawing blood from a vein (Correct answer)
Centrifugation of blood specimens

Correct answer: The act of drawing blood from a vein

Phlebotomy is the clinical procedure of incising a vein or puncturing it to collect a blood specimen.

Question 8: Which type of transfusion reaction is caused by preformed recipient antibodies against donor HLA or granulocyte antigens?

Septic transfusion reaction
Transfusion-related acute lung injury (TRALI)
Febrile non-hemolytic transfusion reaction (FNHTR) (Correct answer)
Anaphylaxis

Correct answer: Febrile non-hemolytic transfusion reaction (FNHTR)

FNHTR is caused by recipient antibodies reacting with donor leukocyte HLA antigens, releasing cytokines that cause fever and chills during transfusion.

Question 9: During the hepatitis B 'window period,' which serological marker is the ONLY one detectable?

Anti-HBc IgM (Correct answer)
HBeAg
Anti-HBs
HBsAg

Correct answer: Anti-HBc IgM

During the window period when HBsAg has cleared but anti-HBs has not yet appeared, anti-HBc IgM is the sole detectable marker confirming acute infection.

Question 10: Which immunoglobulin class is the FIRST to be produced during a primary immune response?

IgG
IgM (Correct answer)
IgA
IgE

Correct answer: IgM

IgM is the first antibody produced during a primary immune response before class switching to IgG and other isotypes occurs.

Question 11: Which culture medium is specifically used to isolate Bordetella pertussis?

Regan-Lowe or Bordet-Gengou agar (Correct answer)
Thayer-Martin agar
CIN agar
BCYE agar

Correct answer: Regan-Lowe or Bordet-Gengou agar

Bordetella pertussis requires Bordet-Gengou (charcoal horse blood) or Regan-Lowe agar for isolation due to its fastidious growth requirements.

Question 12: Which blood bank compatibility test is designed to detect recipient antibodies against donor red cell antigens?

Minor crossmatch
Antibody screen
Major crossmatch (Correct answer)
Autologous control

Correct answer: Major crossmatch

The major crossmatch tests recipient serum against donor red cells to detect clinically significant alloantibodies.

Question 13: Which technique uses fluorescent-labeled antibodies to detect antigens in tissue sections or cells?

Rocket electrophoresis
Ouchterlony double diffusion
Direct immunofluorescence (Correct answer)
Latex agglutination

Correct answer: Direct immunofluorescence

Direct immunofluorescence uses fluorochrome-conjugated antibodies applied directly to tissue or cells to visualize specific antigens under a fluorescence microscope.

Question 14: Tendency to gain virulence over time. Untreated conditions tend to get worse, leading to serious sickness or death.

malignancy (Correct answer)
adenocarcinoma
pyelonephritis
hemolytic anemia

Correct answer: malignancy

"Malignancy" primarily refers to the tendency of certain cancers to grow and spread aggressively. However, based on your description, the term that fits the context you provided is "progressive." A condition or disease that tends to worsen over time, leading to serious consequences if left untreated, is described as "progressive." This term encompasses the idea that the condition advances and becomes more severe as time goes on.

Question 15: A speckled ANA pattern with high-titer anti-U1 RNP antibodies is the hallmark of which autoimmune disease?

Systemic lupus erythematosus (SLE)
Sjögren syndrome
Rheumatoid arthritis
Mixed connective tissue disease (MCTD) (Correct answer)

Correct answer: Mixed connective tissue disease (MCTD)

Anti-U1 RNP antibodies producing a speckled ANA pattern are the defining serological marker of mixed connective tissue disease.

Question 16: Condition where the body produces too few platelets

sideroblastic anemia(sideroachrestic anemia)
spina bifida meningocele
aplastic anemia
thrombotic throbocytopenic purpura (TTP) (Correct answer)

Correct answer: thrombotic throbocytopenic purpura (TTP)

Thrombotic Thrombocytopenic Purpura (TTP) is a severe blood disorder characterized by the formation of widespread microvascular thrombi, which rapidly consume platelets. This accelerated consumption leads to a significant and dangerous reduction in the number of circulating platelets (thrombocytopenia). Although the bone marrow may attempt to increase platelet production, it often cannot keep pace with the rapid destruction, resulting in a net deficit of platelets.

Question 17: Which antibody test is the gold standard for confirming Epstein-Barr virus (EBV) as the cause of infectious mononucleosis?

Complete blood count with atypical lymphocytes
Monospot heterophile antibody test
Throat culture for Group A Streptococcus
EBV-specific antibodies (VCA IgM/IgG, EBNA) (Correct answer)

Correct answer: EBV-specific antibodies (VCA IgM/IgG, EBNA)

EBV-specific serology measuring VCA IgM, VCA IgG, EA, and EBNA antibodies provides definitive confirmation of EBV infection and disease stage.

Question 18: Which stain is used to visualize acid-fast bacilli such as Mycobacterium tuberculosis?

Silver stain
Gram stain
Ziehl-Neelsen (carbol fuchsin) stain (Correct answer)
India ink

Correct answer: Ziehl-Neelsen (carbol fuchsin) stain

The Ziehl-Neelsen stain uses carbol fuchsin retained by mycolic acid in the cell wall of acid-fast organisms despite acid-alcohol decolorization.

Question 19: What is the main purpose of a medical technologist's work?

To interact with patients directly
To conduct surgical procedures
To analyze DNA sequencing data
To help healthcare providers make diagnoses (Correct answer)

Correct answer: To help healthcare providers make diagnoses

The main purpose of a medical technologist's work is to perform complex laboratory tests on patient samples, generating accurate and reliable results. These results are then crucial for healthcare providers, such as physicians, to make informed diagnoses, monitor treatment effectiveness, and guide patient care decisions. Their role is foundational to evidence-based medicine.

Question 20: Which viral detection method directly identifies viral antigens in a patient specimen without culture?

PCR
Viral culture
Direct fluorescent antibody (DFA) test (Correct answer)
Serology (antibody titer)

Correct answer: Direct fluorescent antibody (DFA) test

DFA uses fluorescent-labeled antibodies to directly detect viral antigens in respiratory or other specimens within hours.

Question 21: Which parameter directly measures the variation in red blood cell size?

MCV
RDW (Correct answer)
MCHC
MCH

Correct answer: RDW

Red cell distribution width (RDW) quantifies anisocytosis; an elevated RDW indicates heterogeneous RBC sizes.

Question 22: What is the anticoagulant of choice for a complete blood count (CBC) specimen?

Sodium citrate
Oxalate
EDTA (Correct answer)
Heparin

Correct answer: EDTA

EDTA (lavender top tube) chelates calcium to prevent clotting and best preserves cell morphology for CBC analysis.

Question 23: What does an elevated BUN-to-creatinine ratio (>20:1) typically indicate?

Chronic kidney disease
Intrinsic renal failure
Prerenal azotemia (Correct answer)
Postrenal obstruction

Correct answer: Prerenal azotemia

A BUN:Cr ratio >20:1 suggests prerenal causes (dehydration, low cardiac output) where urea reabsorption is disproportionately high.

Question 24: What is the normal fasting blood glucose reference range for adults?

70–99 mg/dL (Correct answer)
100–125 mg/dL
126–140 mg/dL
50–70 mg/dL

Correct answer: 70–99 mg/dL

A fasting plasma glucose of 70–99 mg/dL is considered normal; 100–125 mg/dL indicates prediabetes.

Question 25: A patient's forward type shows A antigen but reverse typing shows no anti-B antibody. This discrepancy is MOST likely due to which cause?

Hypogammaglobulinemia causing absent isohemagglutinins (Correct answer)
Incorrect reagent use
ABO chimerism
Bombay phenotype

Correct answer: Hypogammaglobulinemia causing absent isohemagglutinins

Elderly or immunosuppressed patients with hypogammaglobulinemia may lack expected ABO isohemagglutinins, causing forward-reverse ABO discrepancies.

Question 26: Beta-hemolysis on blood agar combined with bacitracin sensitivity indicates which streptococcal group?

Group D Streptococcus
Group A Streptococcus (S. pyogenes) (Correct answer)
Group B Streptococcus
Viridans streptococci

Correct answer: Group A Streptococcus (S. pyogenes)

Group A Streptococcus (S. pyogenes) shows beta-hemolysis and is inhibited by the bacitracin (A) disk, a key presumptive identification test.

Question 27: Phenylketonuria (PKU) is caused by a deficiency of which enzyme?

Fumarylacetoacetase
Phenylalanine hydroxylase (Correct answer)
Tyrosinase
Homogentisate oxidase

Correct answer: Phenylalanine hydroxylase

PKU results from deficient phenylalanine hydroxylase, causing phenylalanine accumulation and intellectual disability if untreated.

Question 28: In the zone of equivalence during a precipitation reaction, which of the following occurs?

Antibody is in excess, inhibiting precipitate
Optimal lattice formation produces maximum precipitate (Correct answer)
No precipitation occurs due to soluble complexes
Antigen is in excess, inhibiting precipitate

Correct answer: Optimal lattice formation produces maximum precipitate

In the zone of equivalence, antigen and antibody are present in optimal proportions, allowing maximum cross-linked lattice formation and precipitation.

Question 29: CSF pigmentation due to subarachnoid hemorrhage

pyelonephritis
aplastic anemia
xanthochromia (Correct answer)
pernicious anemia

Correct answer: xanthochromia

Xanthochromia refers to the yellowish discoloration of cerebrospinal fluid (CSF), which is a key indicator of a subarachnoid hemorrhage. This pigmentation occurs when red blood cells, released into the CSF during bleeding, lyse and release hemoglobin. The hemoglobin is then metabolized into bilirubin, giving the CSF its characteristic yellow hue, confirming that bleeding occurred several hours prior to the lumbar puncture.

Question 30: A patient's ABO typing shows forward grouping of A but reverse grouping is missing the expected anti-B agglutination. What is the MOST likely cause?

Polyagglutination
Cold agglutinins
Bombay phenotype
Hypogammaglobulinemia (Correct answer)

Correct answer: Hypogammaglobulinemia

Hypogammaglobulinemia reduces isohemagglutinin levels, which can cause weak or absent reverse group reactions.

Question 31: Anemia as result of inhibition of DNA synthesis during RBS production

microalbumanuria
amniotic fluid
megaloblastic anemia (Correct answer)
pernicious anemia

Correct answer: megaloblastic anemia

Megaloblastic anemia is a type of anemia characterized by the production of abnormally large, immature red blood cells (megaloblasts) due to impaired DNA synthesis. This defect typically arises from deficiencies in vitamin B12 or folate, both of which are crucial cofactors for DNA replication. Without adequate DNA synthesis, red blood cell precursors in the bone marrow cannot divide properly, leading to the formation of dysfunctional cells.

Question 32: What is the main difference between a medical technologist and a lab technician?

Their salaries and job benefits
Their work hours and job titles
Their level of involvement in patient care
The extent of their training and the complexity of tasks they can perform (Correct answer)

Correct answer: The extent of their training and the complexity of tasks they can perform

The primary distinction between a medical technologist (Clinical Laboratory Scientist) and a lab technician (Clinical Laboratory Technician) lies in their educational background and the complexity of tasks they are qualified to perform. Medical technologists generally hold a bachelor's degree and perform advanced tests, interpret results, and troubleshoot instruments, while technicians typically have an associate's degree and perform more routine tests under supervision.

Question 33: Which enzyme is the MOST sensitive and specific marker for acute myocardial infarction?

CK-MB
LDH
Troponin I or T (Correct answer)
AST

Correct answer: Troponin I or T

Cardiac troponins (I and T) are the gold-standard biomarkers for myocardial injury due to their high cardiac specificity and sensitivity.

Question 34: Which coagulation factor deficiency results in a prolonged PTT but normal PT and thrombin time, with NO bleeding tendency?

Factor XII (Correct answer)
Factor XI
Factor V
Factor VIII

Correct answer: Factor XII

Factor XII (Hageman factor) deficiency prolongs PTT but causes no clinical bleeding because it is not essential for in vivo hemostasis.

Question 35: Which federal law governs the quality standards for all laboratory testing in the United States?

HIPAA
CLIA '88 (Correct answer)
FDA Modernization Act
OSHA Act

Correct answer: CLIA '88

The Clinical Laboratory Improvement Amendments of 1988 (CLIA '88) establish quality standards for all U.S. laboratory testing.

Question 36: Which organism is identified by its characteristic 'safety pin' bipolar staining appearance?

Yersinia pestis (Correct answer)
Burkholderia pseudomallei
Francisella tularensis
Brucella melitensis

Correct answer: Yersinia pestis

Yersinia pestis displays bipolar staining (safety pin appearance) with Wayson stain, a key feature for rapid presumptive identification.

Question 37: Which complement component is shared by ALL three activation pathways (classical, alternative, and lectin)?

Factor B
MASP-1
C1q
C3 (Correct answer)

Correct answer: C3

C3 is the central convergence point of all three complement pathways; its cleavage to C3a and C3b is the pivotal step in complement activation.

Question 38: In clinical chemistry, 'substrate' refers to:

The inhibitor that blocks enzyme activity
The cofactor required by an enzyme
The product formed at the end of an enzymatic reaction
The molecule upon which an enzyme acts (Correct answer)

Correct answer: The molecule upon which an enzyme acts

A substrate is the specific molecule an enzyme binds and converts to product during a biochemical reaction.

Question 39: In a competitive immunoassay, what is the relationship between patient analyte concentration and measured signal?

Exponential: signal doubles with each unit of analyte
Inverse: higher analyte produces lower signal (Correct answer)
No relationship; signal is fixed by antibody amount
Direct: higher analyte produces higher signal

Correct answer: Inverse: higher analyte produces lower signal

In competitive immunoassay, patient antigen competes with labeled antigen for limited antibody sites; more patient antigen displaces more label, reducing the measured signal.

Question 40: Which specimen tube should be used for serum chemistry testing?

Light blue (citrate)
Green (heparin)
Lavender (EDTA)
Red or gold (SST) (Correct answer)

Correct answer: Red or gold (SST)

Red or gold SST (serum separator) tubes allow blood to clot; serum is separated by centrifugation for most chemistry panels.

Question 41: Dividing the body horizontally.

Transverse Plane (Correct answer)
Thoracic Cavity
Medial
Midsagittal Plane

Correct answer: Transverse Plane

Anatomical planes are imaginary lines used to divide the body for descriptive purposes. A transverse plane, also known as a horizontal or axial plane, divides the body into superior (upper) and inferior (lower) sections. This definition directly corresponds to 'dividing the body horizontally,' making it the correct term.

Question 42: What does the medical abbreviation 'STAT' indicate?

Standard testing after two hours
Scheduled testing at timed intervals
Specimen transport and tracking
Immediate, urgent testing (Correct answer)

Correct answer: Immediate, urgent testing

STAT (from Latin 'statim') means immediately, signaling that a test result is needed urgently.

Question 43: Which coagulation factor is measured by the prothrombin time (PT) but NOT the aPTT?

Factor IX
Factor VIII
Factor X
Factor VII (Correct answer)

Correct answer: Factor VII

Factor VII is part of the extrinsic pathway and is measured by PT (via tissue factor), while aPTT evaluates the intrinsic pathway (Factors VIII, IX, XI, XII).

Question 44: Which electrolyte imbalance is MOST likely in a patient with prolonged vomiting?

Hypernatremia
Hypokalemic metabolic alkalosis (Correct answer)
Hyperkalemia
Hyperchloremia

Correct answer: Hypokalemic metabolic alkalosis

Prolonged vomiting causes loss of HCl from the stomach, leading to hypokalemia and metabolic alkalosis.

Question 45: An anion gap of 24 mEq/L in a diabetic patient with nausea suggests which diagnosis?

Hyperglycemic hyperosmolar state
Renal tubular acidosis
Diabetic ketoacidosis (Correct answer)
Lactic acidosis

Correct answer: Diabetic ketoacidosis

Elevated anion gap metabolic acidosis in a diabetic patient is the hallmark of DKA, where ketoacids accumulate and widen the anion gap.

Question 46: Decreased platelet count brought on by heparin treatment

Supravital staining
Heparin induced-thrombocytopenia (HIT) (Correct answer)
Prothrombin time (pt)
Lupus anticoagulant (lac)

Correct answer: Heparin induced-thrombocytopenia (HIT)

Heparin-induced thrombocytopenia (HIT) is a serious, immune-mediated adverse reaction to heparin treatment, characterized by a significant decrease in platelet count (thrombocytopenia). Paradoxically, despite the low platelet count, HIT increases the risk of thrombosis (blood clots). The description directly links the decreased platelet count to heparin treatment, which is the defining feature of this condition.

Question 47: What is the average annual salary range for a medical technologist in the United States?

$100,000 - $150,000
Less than $40,000
$60,162 - $80,139 (Correct answer)
$250,000 or higher

Correct answer: $60,162 - $80,139

According to various labor statistics and professional surveys, the average annual salary range for a medical technologist (or Clinical Laboratory Scientist) in the United States typically falls between approximately $60,162 and $80,139. This range can vary based on factors such as experience, geographic location, type of facility, and specific specialty certifications.

Question 48: The hospital's division that investigates drugs, alcohol, toxins, and heavy metals is

Endocrinology
Serology/Immunology
Toxicology (Correct answer)
Cytology

Correct answer: Toxicology

Toxicology is the specialized division within a hospital laboratory responsible for the detection, identification, and quantification of drugs, alcohol, toxins, and heavy metals in biological samples. This department plays a crucial role in diagnosing poisonings, monitoring therapeutic drug levels, and investigating substance abuse. The other divisions listed focus on different types of analyses, such as immune responses, hormones, or cellular structures.

Question 49: The Weil-Felix test uses Proteus OX antigen strains to diagnose infections caused by:

Rickettsia species (Correct answer)
Borrelia burgdorferi
Leptospira species
Brucella species

Correct answer: Rickettsia species

Weil-Felix exploits cross-reactive antigens shared between certain Rickettsia species and Proteus OX2, OX19, and OXK strains to detect rickettsial infections.

Question 50: CAMP test positivity is used to identify which pathogen?

Listeria monocytogenes
Clostridium perfringens
Corynebacterium diphtheriae
Streptococcus agalactiae (Group B Strep) (Correct answer)

Correct answer: Streptococcus agalactiae (Group B Strep)

Group B Streptococcus produces CAMP factor that enhances beta-lysin activity of S. aureus, creating an arrowhead hemolysis pattern.

Question 51: What is the storage temperature for packed red blood cells?

1–6°C (Correct answer)
–80°C
20–24°C
–18°C or colder

Correct answer: 1–6°C

Packed RBCs must be stored at 1–6°C in the blood bank refrigerator and have a shelf life of up to 42 days with additive solutions.

Question 52: India ink preparation is used to detect which fungal pathogen in CSF?

Candida albicans
Cryptococcus neoformans (Correct answer)
Histoplasma capsulatum
Aspergillus fumigatus

Correct answer: Cryptococcus neoformans

India ink reveals the large polysaccharide capsule of Cryptococcus neoformans as a clear halo against a black background in CSF.

Question 53: Antigenic variation is a major virulence mechanism of which sexually transmitted pathogen?

Treponema pallidum
Neisseria gonorrhoeae (Correct answer)
Haemophilus ducreyi
Chlamydia trachomatis

Correct answer: Neisseria gonorrhoeae

N. gonorrhoeae undergoes pilin antigenic variation, allowing it to evade the immune response and colonize mucosal surfaces persistently.

Question 54: How much of Europe's overall healthcare budget is spent on medical technology? This inquiry is necessary.

48%
7.5% (Correct answer)
17%

Correct answer: 7.5%

This is a factual question regarding healthcare economics. According to various reports and statistics from organizations like MedTech Europe, medical technology accounts for approximately 7.5% of the overall healthcare budget in Europe. This percentage reflects the significant, yet contained, cost contribution of devices and diagnostics to total healthcare spending.

Question 55: What is the level of education required to become a medical technologist?

No formal education is required
Master's degree or higher
At least a bachelor's degree (Correct answer)
High school diploma is sufficient

Correct answer: At least a bachelor's degree

To become a certified medical technologist (also known as a Clinical Laboratory Scientist), a minimum of a bachelor's degree in medical technology or a closely related scientific field is required. This extensive education includes coursework in biology, chemistry, microbiology, and specialized clinical laboratory sciences, often culminating in a clinical internship or practicum.

Question 56: Colonies with a green metallic sheen on EMB agar are characteristic of which organism?

Escherichia coli (Correct answer)
Pseudomonas aeruginosa
Klebsiella pneumoniae
Proteus mirabilis

Correct answer: Escherichia coli

E. coli produces a green metallic sheen on eosin methylene blue (EMB) agar due to strong lactose and acid production.

Question 57: Irradiation of blood products is performed primarily to prevent which transfusion complication?

Transfusion-related acute lung injury (TRALI)
Transfusion-associated graft-versus-host disease (TA-GvHD) (Correct answer)
Bacterial contamination
Febrile non-hemolytic transfusion reaction

Correct answer: Transfusion-associated graft-versus-host disease (TA-GvHD)

Gamma or X-ray irradiation inactivates donor T lymphocytes, preventing them from engrafting and attacking immunocompromised recipients (TA-GvHD).

Question 58: Which condition causes a true decrease in serum albumin?

Dehydration
Nephrotic syndrome (Correct answer)
Prolonged tourniquet use
Hemolysis of specimen

Correct answer: Nephrotic syndrome

Nephrotic syndrome causes massive urinary protein loss, leading to hypoalbuminemia and oncotic pressure changes.

Question 59: A homogeneous ANA fluorescence pattern is most commonly associated with antibodies against:

Anti-Sm antibodies
Anti-SSA/Ro antibodies
Anti-centromere antibodies
Anti-dsDNA or anti-histone antibodies (Correct answer)

Correct answer: Anti-dsDNA or anti-histone antibodies

A homogeneous ANA pattern reflects antibodies against double-stranded DNA or histone proteins and is classically associated with systemic lupus erythematosus.

Question 60: Which lipoprotein is considered protective against cardiovascular disease?

LDL
VLDL
HDL (Correct answer)
Chylomicron

Correct answer: HDL

HDL (high-density lipoprotein) transports cholesterol from peripheral tissues back to the liver (reverse cholesterol transport), reducing atherosclerosis risk.

Question 61: Serum creatinine is primarily used to assess the function of which organ?

Pancreas
Liver
Kidney (Correct answer)
Heart

Correct answer: Kidney

Creatinine is filtered by the glomerulus and serves as a reliable endogenous marker of glomerular filtration rate (GFR).

Question 62: A positive catalase test followed by a positive coagulase test identifies which organism?

Enterococcus faecalis
Listeria monocytogenes
Streptococcus pyogenes
Staphylococcus aureus (Correct answer)

Correct answer: Staphylococcus aureus

Catalase-positive and coagulase-positive results are the key biochemical tests identifying S. aureus among staphylococci.

Question 63: A negative urease test, positive indole test, and positive oxidase test best describes which organism?

Vibrio cholerae (Correct answer)
Enterococcus faecalis
Proteus mirabilis
Helicobacter pylori

Correct answer: Vibrio cholerae

Vibrio cholerae is oxidase-positive, indole-positive, and urease-negative, distinguishing it from other enteric pathogens.

Question 64: Which section of RA 5527 states that all successful examinees must take a professional oath before the Board or a person authorized to administer oaths before beginning to practice medical technology in the Philippines?

18
29
None of the above (Correct answer)
1

Correct answer: None of the above

The requirement for successful examinees to take a professional oath before practicing medical technology in the Philippines is explicitly stated in Section 20 of RA 5527. Since Section 20 is not provided as an option among A, B, or C, the correct answer is 'None of the above.' This highlights the importance of knowing specific sections of the act.

Question 65: Hemoglobin A1c (HbA1c) reflects average blood glucose over approximately how many weeks?

16–20 weeks
10–12 weeks (Correct answer)
2–4 weeks
6–8 weeks

Correct answer: 10–12 weeks

HbA1c reflects average glycemia over approximately 8–12 weeks, corresponding to the lifespan of a red blood cell.

Question 66: Which reference method is the gold standard for glucose measurement in clinical chemistry?

Hexokinase method (Correct answer)
Benedict's test
Orthotoluidine method
Glucose oxidase method

Correct answer: Hexokinase method

The hexokinase method is considered the reference method for serum glucose due to its high specificity and accuracy.

Question 67: Away from the point of attachment

Proximal
Distal (Correct answer)
Anterior
Medial

Correct answer: Distal

'Distal' is an anatomical directional term meaning farther away from the point of attachment or origin, or farther from the trunk of the body. For example, the fingers are distal to the wrist because they are further from the point where the arm attaches to the body. This term is the opposite of proximal.

Question 68: Many beneficial bacteria inhabiting the human intestines.

d-dimer
fungal meningitis
fecal flora (Correct answer)
meningitis

Correct answer: fecal flora

Fecal flora refers to the diverse community of microorganisms, predominantly bacteria, that naturally inhabit the human intestines, particularly the colon. These 'beneficial bacteria' play vital roles in digestion, vitamin synthesis, and immune system development, contributing significantly to overall gut health.

Question 69: Obligate intracellular parasites that cause atypical pneumonia and cannot be grown on standard agar include which organism?

Legionella pneumophila
Chlamydophila pneumoniae (Correct answer)
Coxiella burnetii
Mycoplasma pneumoniae

Correct answer: Chlamydophila pneumoniae

Chlamydophila pneumoniae is an obligate intracellular pathogen that requires host cell energy and cannot replicate on standard bacteriologic media.

Question 70: A patient with blood type A negative can receive red blood cells from which donor types?

A– and O– only (Correct answer)
AB– and A– only
Any type if crossmatch negative
A+ and O+ only

Correct answer: A– and O– only

In emergency or standard practice, Rh-negative patients should receive Rh-negative RBCs to prevent sensitization; type A– patients can receive A– and O– units.

Question 71: What is the purpose of the antibody screen (indirect antiglobulin test) before transfusion?

Identify bacterial contamination in blood product
Confirm compatibility by mixing donor and patient cells
Detect unexpected alloantibodies in patient serum (Correct answer)
Determine patient's ABO type

Correct answer: Detect unexpected alloantibodies in patient serum

The antibody screen tests patient serum against commercially prepared RBCs to detect clinically significant alloantibodies before transfusion.

Question 72: The Quellung reaction (capsular swelling) is used to identify and serotype which organism?

Haemophilus influenzae
Staphylococcus aureus
Neisseria meningitidis
Streptococcus pneumoniae (Correct answer)

Correct answer: Streptococcus pneumoniae

The Quellung reaction occurs when type-specific antibody binds the polysaccharide capsule of S. pneumoniae, making it appear swollen under microscopy.

Question 73: A positive crossmatch occurs when donor red cells are incompatible with which patient component?

Donor plasma
Patient serum or plasma (Correct answer)
Patient platelets
Patient red blood cells

Correct answer: Patient serum or plasma

The major crossmatch tests donor RBCs against recipient serum/plasma to detect antibodies that could destroy transfused cells.

Question 74: Which culture medium is selective for gram-negative enteric bacteria?

MacConkey agar (Correct answer)
Blood agar
Sabouraud dextrose agar
Chocolate agar

Correct answer: MacConkey agar

MacConkey agar contains bile salts and crystal violet that inhibit gram-positive organisms while supporting gram-negative growth.

Question 75: Elevated serum alkaline phosphatase (ALP) with normal transaminases is MOST consistent with which condition?

Hepatocellular damage
Acute viral hepatitis
Obstructive jaundice or bone disease (Correct answer)
Alcoholic hepatitis

Correct answer: Obstructive jaundice or bone disease

An isolated ALP elevation suggests cholestasis or bone disease; GGT elevation alongside confirms hepatic origin.

Question 76: Which antibody is naturally occurring, IgM class, and causes immediate hemolysis in ABO-incompatible transfusions?

Anti-Jka
Anti-K (Kell)
Anti-A and anti-B isohemagglutinins (Correct answer)
Anti-D

Correct answer: Anti-A and anti-B isohemagglutinins

ABO isohemagglutinins are IgM antibodies that fix complement and cause acute intravascular hemolysis in ABO-mismatched transfusions.

Question 77: Universal donor red blood cells are of which blood type?

Type O positive
Type A positive
Type O negative (Correct answer)
Type AB positive

Correct answer: Type O negative

Type O negative RBCs lack A, B, and Rh antigens, making them safe to transfuse to any recipient in emergencies.

Question 78: A patient with hypothyroidism would most likely show which thyroid function test pattern?

Low TSH with high free T4
Normal TSH with low free T4
High TSH with low free T4 (Correct answer)
High TSH with high free T4

Correct answer: High TSH with low free T4

Primary hypothyroidism shows elevated TSH (pituitary compensation) and decreased free T4 due to reduced thyroid output.

Question 79: In a blood gas analysis, a pH of 7.28 with elevated pCO2 and normal HCO3 indicates which acid-base disorder?

Metabolic acidosis
Metabolic alkalosis
Respiratory acidosis (Correct answer)
Respiratory alkalosis

Correct answer: Respiratory acidosis

Low pH with elevated pCO2 (retained CO2) and normal bicarbonate indicates respiratory acidosis from hypoventilation.

Question 80: Which blood group system is most clinically significant after ABO and Rh for causing hemolytic transfusion reactions?

Kidd (Jk)
Lewis (Le)
Duffy (Fy)
Kell (K) (Correct answer)

Correct answer: Kell (K)

Kell system antibodies, particularly anti-K, are strongly immunogenic and clinically significant, causing both hemolytic transfusion reactions and HDFN.

Question 81: Schistocytes on a peripheral blood smear combined with thrombocytopenia and elevated creatinine MOST suggest:

ITP
TTP/HUS (Correct answer)
DIC
Sickle cell disease

Correct answer: TTP/HUS

The triad of microangiopathic hemolytic anemia (schistocytes), thrombocytopenia, and renal involvement defines TTP/HUS.

Question 82: Which organism is the MOST common cause of community-acquired pneumonia in the US?

Klebsiella pneumoniae
Haemophilus influenzae
Legionella pneumophila
Streptococcus pneumoniae (Correct answer)

Correct answer: Streptococcus pneumoniae

Streptococcus pneumoniae (pneumococcus) remains the leading bacterial cause of community-acquired pneumonia in all age groups.

Question 83: RhoGAM (anti-D immunoglobulin) is administered to Rh-negative mothers to prevent sensitization by doing which of the following?

Suppressing the maternal immune system broadly
Destroying fetal RBCs in the mother's circulation
Blocking fetal Rh D antigens from sensitizing the mother (Correct answer)
Stimulating maternal anti-D antibody production

Correct answer: Blocking fetal Rh D antigens from sensitizing the mother

RhoGAM binds to fetal Rh D-positive RBCs that entered maternal circulation, preventing them from triggering maternal anti-D alloimmunization.

Question 84: Rheumatoid factor (RF) is an autoantibody directed against which target?

The Fc portion of IgG (Correct answer)
Cyclic citrullinated peptides (CCP)
Histone proteins
Double-stranded DNA

Correct answer: The Fc portion of IgG

Rheumatoid factor is typically an IgM autoantibody that binds to the Fc region of IgG molecules, forming immune complexes in rheumatoid arthritis.

Question 85: Platelets are stored at which temperature with continuous agitation?

–18°C or colder
20–24°C (Correct answer)
37°C
1–6°C

Correct answer: 20–24°C

Platelets must be stored at 20–24°C with continuous gentle agitation to prevent clumping and maintain viability; shelf life is 5–7 days.

Question 86: Which test is used to evaluate liver synthetic function?

AST
ALT
Prothrombin time (PT) (Correct answer)
Alkaline phosphatase

Correct answer: Prothrombin time (PT)

The liver synthesizes clotting factors, so PT/INR elevation indicates impaired hepatic synthetic function.

Question 87: Hypersegmented neutrophils on a peripheral smear are a hallmark of which deficiency?

Iron deficiency
Copper deficiency
Folate or vitamin B12 deficiency (Correct answer)
Zinc deficiency

Correct answer: Folate or vitamin B12 deficiency

Hypersegmented neutrophils (>5 lobes) indicate megaloblastic anemia caused by folate or vitamin B12 deficiency.

Question 88: Washed red blood cells are used for patients with which condition to prevent transfusion reactions?

Severe IgA deficiency with anti-IgA antibodies (Correct answer)
Sickle cell disease requiring exchange transfusion
Iron deficiency anemia
Thrombotic thrombocytopenic purpura

Correct answer: Severe IgA deficiency with anti-IgA antibodies

IgA-deficient patients with anti-IgA can have anaphylactic reactions to plasma proteins; washing removes IgA from donor blood.

Question 89: Which of the following is not a form of medicine?

Contact Lenses
They are all considered medical technologies (Correct answer)
HIV Test
Heart Valves
Wheelchairs

Correct answer: They are all considered medical technologies

Medical technology encompasses a vast range of products, devices, and procedures used to prevent, diagnose, monitor, treat, or alleviate disease and injury. Wheelchairs, heart valves, HIV tests, and contact lenses all fall under this broad definition, as they are designed to improve health outcomes or aid in diagnosis. Therefore, all listed items are considered medical technologies.

Question 90: The shelf life of fresh frozen plasma (FFP) stored at –18°C or colder is how long?

5 years
1 year (Correct answer)
7 days
42 days

Correct answer: 1 year

FFP stored at –18°C or colder has a shelf life of 1 year; it must be thawed at 30–37°C before use and transfused within 24 hours.

Question 91: The Coombs test (direct antiglobulin test) detects which of the following?

IgG or complement bound to red blood cells in vivo (Correct answer)
Free antibodies in serum
ABO blood group antigens
Platelet antibodies

Correct answer: IgG or complement bound to red blood cells in vivo

The direct antiglobulin test (DAT) detects IgG or complement already coating the patient's RBCs in vivo, as in autoimmune hemolytic anemia.

Question 92: Gram-positive cocci in clusters that are catalase-positive and coagulase-negative are MOST likely which genus?

Streptococcus
Bacillus
Staphylococcus epidermidis group (Correct answer)
Enterococcus

Correct answer: Staphylococcus epidermidis group

Coagulase-negative staphylococci (CoNS) like S. epidermidis are gram-positive cocci in clusters that are catalase-positive but coagulase-negative.

Question 93: Which transfusion reaction presents with fever, flank pain, hemoglobinuria, and hypotension within minutes of starting transfusion?

Transfusion-associated circulatory overload (TACO)
Febrile non-hemolytic reaction
Acute hemolytic transfusion reaction (Correct answer)
Allergic/urticarial reaction

Correct answer: Acute hemolytic transfusion reaction

Acute hemolytic transfusion reaction from ABO incompatibility causes complement-mediated intravascular hemolysis with characteristic hemoglobinuria and shock.

Question 94: Which Westgard rule indicates a systematic error when one control value exceeds the mean by more than 2 standard deviations?

R-4s rule
1-2s warning rule (Correct answer)
2-2s rule
10x rule

Correct answer: 1-2s warning rule

The 1-2s rule is a warning rule triggered when one control value falls outside ±2 SD, prompting evaluation but not automatic rejection.

Question 95: Medication for insulin secretion from the pancreas

cirrhosis
thromboembolism
tolbutamide (Correct answer)
chyle

Correct answer: tolbutamide

Tolbutamide is an oral hypoglycemic medication belonging to the sulfonylurea class, primarily used to treat type 2 diabetes. Its main mechanism of action is to stimulate the beta cells within the pancreas to increase the secretion of insulin. By promoting insulin release, tolbutamide helps to lower blood glucose levels, thereby managing hyperglycemia in diabetic patients.

Question 96: Section 20 of RA 5527 is titled as follows:

Title
Oath Taking (Correct answer)
Minimum Required Course
Roster of Med Tech

Correct answer: Oath Taking

Section 20 of Republic Act 5527, also known as the Philippine Medical Technology Act of 1969, is specifically titled 'Oath Taking.' This section mandates that all successful examinees must take a professional oath before the Board or an authorized person before they can legally commence practicing medical technology in the Philippines. This formal ceremony signifies their commitment to the profession's ethical standards.

Question 97: Which test detects the presence of bacterial DNA replication inhibition by an antibiotic?

Beta-lactamase assay
E-test (epsilometer test)
Kirby-Bauer disk diffusion
Broth microdilution MIC (Correct answer)

Correct answer: Broth microdilution MIC

Broth microdilution determines the minimum inhibitory concentration (MIC), quantifying the lowest drug concentration that inhibits visible bacterial growth.

Question 98: Nearer the front especially situated in the front of the body of nearer to the head.

Proximal
Anterior (Correct answer)
Distal
Medial

Correct answer: Anterior

'Anterior' is an anatomical directional term meaning nearer the front of the body or situated in the front. It is often used interchangeably with 'ventral' to describe the front surface of the body or a body part. For example, the sternum is anterior to the spine, indicating its position towards the front.

Question 99: Who was the first to discover the cell?

Anton van Leeuwenhoek
Robert Hooke (Correct answer)
Alexander Fleming
Susumo Tonegawa

Correct answer: Robert Hooke

Robert Hooke was an English scientist who, in 1665, observed thin slices of cork under a microscope. He noticed tiny, box-like structures that reminded him of the small rooms (cells) in a monastery, and thus coined the term 'cell.' His observations were groundbreaking and laid the foundation for cell theory, a cornerstone of modern biology.

Question 100: Hemolytic disease of the fetus and newborn (HDFN) is MOST commonly caused by antibody to which antigen?

Rh D antigen (Correct answer)
Duffy antigen
Kell antigen
ABO antigens

Correct answer: Rh D antigen

Anti-D is the most common cause of severe HDFN; Rh-negative mothers sensitized by Rh-positive fetal RBCs produce IgG anti-D that crosses the placenta.

Medical Technologist (MT) / Medical Laboratory Scientist (MLS) ASCP Exam

The MLS (ASCP) exam certifies medical laboratory scientists who perform complex tests in clinical laboratories, analyzing blood, tissue, and other body fluids.

100

Questions

150 min

Time Limit

400%

To Pass

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