- The 2026 MMB exam has 305 questions across six sections in 6 hours 10 minutes of active testing.
- Bacteria is worth 49% of the blueprint - nearly half the exam.
- Passing requires a scaled score of 500, not a raw percentage correct.
- Total initial fee is USD 2,100, including a USD 200 nonrefundable administrative fee.
Quick Facts Snapshot
This cheat sheet is a condensed, one-page-style reference for the Certification in Pathology: Medical Microbiology (MMB) examination administered by the American Board of Pathology (ABPath). It's meant to sit next to your notes during the final stretch of prep - a fast way to confirm numbers, domain weights, and logistics without digging through PDFs. For deeper explanations of any item below, see the full MMB Study Guide 2026 and the MMB Exam Domains 2026 guide.
| Item | 2026 Detail |
|---|---|
| Certifying body | American Board of Pathology (ABPath) |
| Exam format | Computer-based, single-best-answer multiple-choice with written/practical material |
| Total questions | 305 across six sections |
| Active testing time | 6 hours 10 minutes |
| Total scheduled time | 8 hours 40 minutes (includes instructions, survey, breaks) |
| Passing standard | Scaled score of 500 |
| Initial fee | USD 2,100 (includes USD 200 nonrefundable admin fee) |
| Test location | Pearson VUE Professional Centers, in person only |
Domain Weights at a Glance
The 2026 blueprint splits content into seven domains. Knowing the approximate weight of each one tells you where to invest hours. A full breakdown of each domain's testable content lives in the MMB Exam Domains 2026: Complete Guide to All 7 Content Areas, but here is the cheat-sheet version.
Domain 2: Bacteria - 49%
Nearly half the exam. Covers bacterial identification, classification, resistance mechanisms, and clinically relevant species across systems.
- Highest-yield domain by a wide margin
- Deserves the largest single block of study time
Domain 3: Fungi - 13%
Second-largest content area; expect questions spanning mycology identification and pathogenesis.
Domain 4: Viruses & Prions - 11%
Virology and prion disease content, tested alongside fungi and parasites as mid-weight domains.
Domain 5: Parasites - 11%
Parasitology identification and clinical correlation, comparable in weight to viruses & prions.
Domain 6: Traditional and Molecular Methods, NOS - 9%
Diagnostic methodology, both classical and molecular, not otherwise specified elsewhere in the blueprint.
Domain 1: Management & Informatics-Medical Microbiology - 5%
Laboratory management and informatics as applied specifically to medical microbiology practice.
Domain 7: Management and Informatics-General - 2%
The smallest domain; general management and informatics content not tied to a specific microbiology subdiscipline.
Key Takeaway
Bacteria (49%) plus Fungi (13%) together account for well over half the exam. If your study time doesn't mirror that ratio, rebalance before test day.
Exam Mechanics Cheat Sheet
Understanding the format itself reduces surprises. A few mechanics to memorize:
- Question style: single-best-answer multiple choice, including written/practical material rather than pure recall items.
- Structure: 305 questions divided across six sections.
- Timing: 6 hours 10 minutes of active testing, within a total scheduled window of 8 hours 40 minutes that includes instructions, a survey, and breaks.
- Reference material: ABPath provides the Medical Microbiology Terminology reference during the exam. This is a narrow, exam-specific reference - not general open-book access to textbooks or notes.
- Scoring: the passing standard is a scaled score of 500. This is not equivalent to answering 50% of questions correctly; scaled scoring accounts for item difficulty. Read the mechanics in detail in MMB Passing Score 2026: Exactly What You Need to Pass.
For context on how difficult the exam feels in practice, and what "difficulty" actually means given the recent pass rate, see How Hard Is the MMB Exam? Complete Difficulty Guide 2026 and MMB Pass Rate 2026: What the Data Shows.
Registration, Fees & Eligibility
Before you can sit for the exam, you need to satisfy ABPath's eligibility pathway and budget for the associated costs.
Fee Structure
The 2026 initial application/examination fee is USD 2,100 total, which includes a USD 200 nonrefundable administrative fee. Plan for this as a single line item rather than assuming smaller incremental charges. A full cost breakdown, including how the administrative portion is treated if you need to withdraw or reschedule, is covered in MMB Certification Cost 2026: Complete Pricing Breakdown.
Eligibility Checklist
- Accepted primary certification in AP/CP, AP, or CP - or certification by another ABMS member board.
- 12 months of ACGME-accredited Medical Microbiology fellowship training.
- Compliance with applicable ABPath medical education, licensure, and program-director verification requirements.
If you're still mapping out whether you qualify, the detailed pathway is spelled out in MMB Requirements 2026: Eligibility, Prerequisites & How to Qualify. For scheduling windows and deadlines tied to the fee cycle, check MMB Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Key Takeaway
Confirm your fellowship documentation and program-director verification early - eligibility paperwork, not just study time, is often the long pole in the schedule.
Why Bacteria Dominates Your Study Time
With Domain 2 (Bacteria) sitting at 49% of the blueprint, it functions almost like a second, embedded exam within the larger 305-question test. Candidates who treat all six sections as equally weighted tend to under-prepare here relative to its actual footprint.
Practical implications for your review:
- Organize bacterial content by clinically relevant groupings (identification, resistance patterns, and organism-specific pathogenesis) rather than trying to memorize an undifferentiated list.
- Cross-reference bacterial content against Domain 6 (Traditional and Molecular Methods, NOS at 9%), since identification and methodology questions often overlap.
- Don't neglect the smaller domains - Fungi (13%), Viruses & Prions (11%), and Parasites (11%) together still make up more than a third of the exam.
- Treat the two management domains (5% and 2%) as a quick, final review rather than a major time investment, given their combined 7% weight.
This kind of weighting also shapes who benefits most from holding the credential. Physicians pursuing MMB typically work in academic medical centers, reference and hospital laboratories, and public health microbiology roles where organism identification and antimicrobial resistance interpretation are daily responsibilities. If you're weighing career impact, MMB Salary Guide 2026: Complete Earnings Analysis and Is the MMB Certification Worth It? Complete ROI Analysis 2026 go into more depth, and MMB Jobs outlines typical practice settings.
Final-Week Review Plan
Rather than a generic multi-month study calendar, use this compressed structure in the final two weeks to align your remaining hours with the blueprint's actual weight distribution.
Bacteria Deep Review
- Spend the majority of available hours on Domain 2 topics: identification schemes, resistance mechanisms, and clinically significant species.
- Run timed question sets that mimic the single-best-answer format.
Fungi, Viruses & Prions, Parasites
- Rotate through Domains 3, 4, and 5 in proportion to their similar weights (13%, 11%, 11%).
- Focus on differentiating look-alike organisms and life cycles rather than exhaustive memorization.
Methods & Management
- Cover Domain 6 (Traditional and Molecular Methods) and both management domains (1 and 7) in a single condensed pass.
- These combine for 16% of the exam - worth a focused day, not a full week.
Logistics & Light Review
- Confirm your Pearson VUE Professional Center location and check-in requirements.
- Review the Medical Microbiology Terminology reference format so it feels familiar, not novel, on test day.
For a longer-horizon plan that starts months earlier, see the complete MMB Study Guide 2026: How to Pass on Your First Attempt. If you want to build exam-day stamina and question-pacing before your official date, practicing under timed conditions on our practice test platform can help you gauge whether 6 hours 10 minutes of sustained focus feels manageable.
After You Pass: Certification Upkeep
Passing the exam isn't the end of the obligation - current ABPath certificates carry no fixed expiration date, but they remain conditional on ongoing Continuing Certification participation. Keep these requirements on your calendar:
- Biennial PATHway reporting covering professional standing, lifelong learning, and improvement in medical practice.
- Standard CME route: 70 qualifying credits per two-year reporting period, with at least 80% related to your scope of practice. Approved training and research alternatives also exist for those who don't follow the standard CME path.
- ABPath CertLink: a quarterly assessment model requiring a cumulative performance of at least 60% over four years, rather than a single high-stakes recertification exam.
FAQ
The 2026 schedule contains 305 questions spread across six sections, with 6 hours 10 minutes of active testing time.
Bacteria (Domain 2) is the largest content category at 49% of the blueprint, making it the single most important domain to master.
The passing standard is a scaled score of 500. This is a psychometrically scaled result, not a simple 50% raw-correct threshold.
No. Testing is conducted in person at Pearson VUE Professional Centers; there is no remote-proctoring option.
The initial application/examination fee is USD 2,100 total, which includes a USD 200 nonrefundable administrative fee.
Keep this cheat sheet handy alongside the fuller resources linked above - starting with What Is MMB Certification? if you're still confirming the basics, or MMB Certification for the overview page - and pair your review with timed practice on the main practice test site before exam day.