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Exam Review

Key Facts: ASCP M Exam

100

Exam Questions

ASCP BOC M exam page

2.5 hrs

Exam Time

ASCP BOC M exam page

400

Minimum Passing Score

ASCP 100-999 scoring scale

$240

Application Fee

ASCP BOC M exam page

ASCP BOC lists the M exam as 100 multiple-choice questions in 2.5 hours with scores reported on a 100-999 scale and 400 as the minimum passing score. The current M application fee is $240. Candidates must meet specific eligibility routes including education and clinical microbiology experience.

Sample ASCP M Practice Questions

Try these sample questions to review concepts for the ASCP M exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 122+ question experience with AI tutoring.

1Which staining technique differentiates bacteria based on cell wall composition?
A.Acid-fast stain
B.Gram stain
C.India ink
D.Calcofluor white
Explanation: The Gram stain differentiates bacteria based on cell wall structure. Gram-positive organisms have thick peptidoglycan layers that retain crystal violet-iodine complex (appearing purple). Gram-negative organisms have thin peptidoglycan with an outer membrane and take up the safranin counterstain (appearing pink/red). This is the most fundamental test in bacteriology.
2Staphylococcus aureus is differentiated from other staphylococci primarily by which test?
A.Catalase test
B.Coagulase test
C.Oxidase test
D.Bile esculin test
Explanation: The coagulase test differentiates Staphylococcus aureus (coagulase-positive) from coagulase-negative staphylococci (CoNS like S. epidermidis). Coagulase converts fibrinogen to fibrin. Both tube coagulase and slide coagulase (bound coagulase/clumping factor) tests are used. All staphylococci are catalase-positive, so catalase only differentiates staphylococci from streptococci.
3Which selective medium is used to isolate Salmonella and Shigella from stool specimens?
A.Blood agar
B.MacConkey agar
C.Hektoen enteric (HE) agar
D.Sabouraud dextrose agar
Explanation: Hektoen enteric (HE) agar is a selective and differential medium for isolating Salmonella and Shigella from stool. It inhibits normal enteric flora with bile salts while differentiating organisms by lactose/sucrose fermentation and H2S production. Salmonella produces blue-green colonies with black centers (H2S). Shigella produces green colonies without H2S. XLD agar serves a similar purpose.
4What is the catalase test used for?
A.Differentiating Staphylococcus (positive) from Streptococcus (negative)
B.Differentiating Gram-positive from Gram-negative bacteria
C.Identifying anaerobic bacteria
D.Detecting hemolysis
Explanation: The catalase test differentiates catalase-positive organisms (Staphylococcus, Micrococcus) from catalase-negative organisms (Streptococcus, Enterococcus). Catalase decomposes hydrogen peroxide to water and oxygen, producing visible bubbles. A drop of 3% hydrogen peroxide is applied to a colony; immediate bubbling indicates a positive result.
5Which organism causes tuberculosis?
A.Mycobacterium avium
B.Mycobacterium tuberculosis
C.Nocardia asteroides
D.Corynebacterium diphtheriae
Explanation: Mycobacterium tuberculosis is the causative agent of tuberculosis. It is an acid-fast bacillus (AFB) due to mycolic acids in the cell wall. TB diagnosis involves AFB smear, culture on Lowenstein-Jensen or liquid media (MGIT), and molecular testing (GeneXpert MTB/RIF). M. tuberculosis is a slow-growing mycobacterium requiring 2-6 weeks for culture.
6What is the oxidase test used for, and which clinically significant organism is oxidase-positive?
A.Differentiates E. coli from Klebsiella; E. coli is positive
B.Differentiates Pseudomonas aeruginosa (positive) from Enterobacteriaceae (negative)
C.Differentiates S. aureus from S. epidermidis; S. aureus is positive
D.Differentiates Streptococcus from Enterococcus
Explanation: The oxidase test detects cytochrome c oxidase. Pseudomonas aeruginosa is a clinically important oxidase-positive, Gram-negative rod. Most Enterobacteriaceae are oxidase-negative, making the oxidase test a key first step in identifying non-fermenting Gram-negative rods. Neisseria, Campylobacter, and Vibrio are also oxidase-positive.
7Which agar is used to determine hemolytic patterns of streptococci?
A.MacConkey agar
B.Chocolate agar
C.5% sheep blood agar (BAP)
D.Sabouraud dextrose agar
Explanation: 5% sheep blood agar (BAP) is used to determine hemolytic patterns. Beta-hemolysis (complete clearing) is seen with Group A Streptococcus and S. pyogenes. Alpha-hemolysis (partial/green) is seen with S. pneumoniae and viridans streptococci. Gamma-hemolysis (no hemolysis) is seen with Enterococcus and some Group D streptococci.
8Which test differentiates Streptococcus pneumoniae from other alpha-hemolytic streptococci?
A.Coagulase test
B.Optochin sensitivity and bile solubility
C.Bacitracin sensitivity
D.CAMP test
Explanation: S. pneumoniae is differentiated from other alpha-hemolytic streptococci (viridans group) by optochin sensitivity (zone of inhibition 14mm or more with 6mm disk) and bile solubility (cells lyse in 10% sodium deoxycholate). Viridans streptococci are optochin-resistant and bile-insoluble. S. pneumoniae also appears as lancet-shaped diplococci on Gram stain.
9What is the CAMP test used to identify?
A.Staphylococcus aureus
B.Group B Streptococcus (S. agalactiae)
C.Enterococcus faecalis
D.Listeria monocytogenes
Explanation: The CAMP test identifies Group B Streptococcus (S. agalactiae) by demonstrating enhanced hemolysis where the CAMP factor of GBS synergizes with the beta-hemolysin of S. aureus, creating an arrowhead-shaped zone of enhanced hemolysis. GBS is important in neonatal sepsis and meningitis screening during pregnancy.
10What is the disk diffusion (Kirby-Bauer) method for antimicrobial susceptibility testing?
A.A broth dilution method measuring MIC
B.A method where antibiotic-impregnated disks are placed on an inoculated agar plate, and zone diameters are measured to determine susceptibility
C.A molecular method for detecting resistance genes
D.An automated system only
Explanation: The Kirby-Bauer disk diffusion method places antibiotic-impregnated disks on a Mueller-Hinton agar plate inoculated with a standardized bacterial suspension (0.5 McFarland). After overnight incubation, zone diameters around each disk are measured and interpreted as susceptible, intermediate, or resistant using CLSI breakpoints. It is a standardized, cost-effective method for routine AST.

About the ASCP M Exam

The ASCP M exam certifies microbiology technologists in bacteriology, mycology, parasitology, virology, antimicrobial susceptibility testing, culture techniques, molecular diagnostics, and biosafety. This specialty credential validates advanced microbiology bench competency.

Exam sponsor: ASCP BOC / Pearson VUE. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

100 multiple-choice questions

Time Limit

2.5 hours

Passing Score

Scaled score 400 (100-999 scale)

Exam / Certification Fees

$240

Exam sponsor website

Reported exam pass rate: Not publicly disclosed. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

35-40%

Bacteriology

Gram-positive and gram-negative organism identification, biochemical testing, colony morphology, and clinical correlations

15-20%

Mycology & Parasitology

Fungal culture and identification, dermatophytes, yeasts, parasitic life cycles, and microscopic identification

15-20%

Virology & Molecular Diagnostics

Viral culture, rapid antigen detection, molecular testing methods, and emerging pathogen detection

15-20%

Susceptibility Testing & Culture Techniques

Disk diffusion, MIC, automated AST, selective and differential media, and specimen processing

10-15%

Biosafety & Quality Management

BSL classifications, PPE, chemical safety, quality control, proficiency testing, and regulatory compliance

Preparing for the ASCP M Exam

What You Need to Know

  • Passing score: Scaled score 400 (100-999 scale)
  • Assessment: 100 multiple-choice questions
  • Time limit: 2.5 hours
  • Exam / certification fees: $240 Official sources

Using Our Practice Resources

  • Work through all 122 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

ASCP M: Suggested Study Strategy

1Build organism identification flowcharts using Gram reaction, morphology, oxidase, catalase, and key biochemical tests
2Master antimicrobial susceptibility testing methods including disk diffusion, MIC interpretation, and CLSI breakpoints
3Study selective and differential media and know which organisms each medium is designed to isolate
4Review parasitology life cycles and diagnostic stages for commonly tested organisms like Plasmodium and Giardia
5Practice identifying fungal morphology including yeast forms, hyphae types, and characteristic conidial structures
6Know biosafety level requirements for common pathogens and proper specimen handling procedures
7Review molecular diagnostic methods including PCR, nucleic acid probes, and MALDI-TOF principles

Frequently Asked Questions

How many questions are on the ASCP M exam?

The ASCP M exam consists of 100 multiple-choice questions administered over a 2.5-hour testing period at Pearson VUE test centers.

What score do I need to pass the ASCP M exam?

ASCP reports exam scores on a 100-999 scale. The minimum passing score for the M exam is 400.

What topics are tested on the ASCP M exam?

The M exam covers bacteriology, mycology, parasitology, virology, antimicrobial susceptibility testing, culture techniques, molecular diagnostics, specimen processing, and biosafety.

How much does the ASCP M exam cost in 2026?

The current ASCP BOC M application fee is $240 (non-refundable). This fee covers the exam application and one testing attempt.

What is the difference between M(ASCP) and MLS(ASCP)?

M(ASCP) is a specialty credential focused solely on microbiology, while MLS(ASCP) is a generalist certification covering all laboratory disciplines. The M credential demonstrates deeper microbiology expertise.

How should I study for the ASCP M exam?

Bacteriology is the largest content area, so prioritize organism identification flowcharts using Gram stain, colony morphology, and biochemical tests. Also study antimicrobial susceptibility methods and biosafety level requirements.

What career opportunities does the M(ASCP) credential provide?

M(ASCP)-certified technologists can work as microbiology bench specialists, infection control laboratory liaisons, molecular microbiology technologists, or advance into supervisory roles in clinical microbiology departments.