- What BB/TM Actually Stands For
- Who Grants BB/TM Certification
- Who Can Sit for the Exam
- Exam Format, Fees, and Testing Windows
- The 15 Content Domains
- How the Exam Is Scored
- Keeping BB/TM Certification Active
- Who Hires BB/TM-Certified Physicians
- BB/TM vs. SBB(ASCP)
- A Practical Way to Prepare
- Frequently Asked Questions
- BB/TM is a physician subspecialty certification from the American Board of Pathology, not a technologist credential.
- The 2026 exam costs $2,100, including a $200 nonrefundable administrative fee.
- Testing runs September 8-28, 2026 at Pearson VUE centers, with 280 single-best-answer questions.
- Clinical Practice (14%) and HPC Transplantation (11%) are the two heaviest of 15 domains.
What BB/TM Actually Stands For
BB/TM is the official abbreviation the American Board of Pathology (ABPath) uses for its subspecialty certification titled Certification in Pathology: Blood Banking/Transfusion Medicine. This is a physician-level credential awarded to pathologists who have completed fellowship training and passed a dedicated subspecialty examination administered by ABPath. It is not a general medical license, and it is not the same thing as a medical technologist certification that happens to share the same three-letter acronym - a point worth stating plainly because several unrelated credentials in laboratory medicine use "BB/TM" as shorthand. On this site, and in this article, BB/TM refers exclusively to the ABPath physician subspecialty certification described above.
If you landed here trying to confirm the acronym itself, our companion explainer on BB/TM Meaning and the quick reference What Does BB/TM Stand For? both walk through the terminology in more detail.
Who Grants BB/TM Certification
The American Board of Pathology is the certifying body. ABPath oversees primary certification in Anatomic Pathology (AP), Clinical Pathology (CP), or combined AP/CP, and then offers a family of subspecialty certifications - BB/TM among them - for pathologists who pursue additional fellowship training. BB/TM sits alongside other ABPath subspecialties as a distinct, separately examined credential rather than an add-on module to the primary boards.
Because ABPath is the sole issuing organization, every mechanical detail of the process - eligibility rules, the fee schedule, the testing calendar, the content blueprint, and the maintenance requirements - flows from ABPath policy. That is different from some other lab-medicine credentials that are issued by a certification board tied to a professional society rather than a medical specialty board. For a deeper eligibility walkthrough, see BB/TM Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Who Can Sit for the Exam
Candidates for BB/TM must hold one of the following:
- AP/CP or CP primary certification from the American Board of Pathology, or
- Primary certification from another American Board of Medical Specialties (ABMS) member board
In addition to primary certification, candidates need 12 months of ACGME-accredited Blood Banking/Transfusion Medicine fellowship training. Before certification is actually granted, ABPath also requires a qualifying medical degree, verification from the training program, and a full, unrestricted medical license. This is a physician-only pathway - there is no route into BB/TM certification through laboratory science or technologist training alone, which is one of the clearest distinctions from adjacent credentials that share the acronym.
Exam Format, Fees, and Testing Windows
The BB/TM exam is a one-day, computer-based test delivered at Pearson VUE Professional Testing Centers. For 2026, the testing window runs September 8-28, 2026. The exam itself contains 280 single-best-answer multiple-choice questions, combining written and practical material across six sections.
Scheduling-wise, candidates get 6 hours 22 minutes of actual testing time within a full scheduled day of 8 hours 52 minutes - the difference accounting for the tutorial, a survey, lunch, and other scheduled breaks. That's a long day, and pacing across six sections is itself a skill worth practicing before test day, not something to discover for the first time at the testing center.
The 2026 examination fee is $2,100, which includes a $200 nonrefundable administrative fee. For a full breakdown of what that fee covers and how it compares across the certification lifecycle, see BB/TM Certification Cost 2026: Complete Pricing Breakdown. Exact deadlines and scheduling logistics are covered in BB/TM Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Key Takeaway
Budget for the full $2,100 fee up front, including the nonrefundable $200 portion - this isn't recoverable if you need to withdraw or reschedule.
What "Practical Material" Actually Looks Like
Unlike a purely text-based multiple-choice exam, BB/TM's practical component uses antibody-identification panels, images, charts, graphs, tables, diagrams, formulas, and calculations. This means candidates need to be comfortable reading a panel and reasoning through an antibody workup under time pressure, not just recalling definitions. It's a meaningfully different skill from straight recall-based test-taking, and it's why generic exam-prep advice tends to fall short for this particular credential.
The 15 Content Domains
The 2026 examination blueprint organizes content into 15 domains with published approximate Written/Practical percentage weights that total 100%. Knowing the weighting matters because it tells you where your study hours will pay off most.
| Domain | Approx. Weight |
|---|---|
| 1. Clinical Practice | 14% |
| 14. Hematopoietic Progenitor Cell (HPC) Transplantation | 11% |
| 3. RBCs and RBC Components | 10% |
| 5. Hazards of Transfusion: Specific Adverse Events | 10% |
| 8. Blood Donors and Blood Collection | 7% |
| 10. Surgery Patients | 7% |
| 13. Obstetric and Pediatric Patients | 7% |
| 4. Apheresis | 8% |
| 6. Plasma Components and Derivatives | 6% |
| 9. Management, Quality, Legal, & Regulatory Issues | 6% |
| 12. Platelet and Platelet Components | 6% |
| 7. Infectious Hazards of Transfusion | 4% |
| 15. Management and Informatics-General | 2% |
| 2. Histocompatibility and Tissue Banking | 1% |
| 11. Biovigilance | 1% |
Clinical Practice, at 14%, is the single largest domain, followed by HPC Transplantation at 11%. Together with RBCs and RBC Components and Hazards of Transfusion (each 10%), these four domains alone account for roughly 45% of the exam's weight. A candidate who under-prepares any of these four is taking on outsized risk relative to a candidate who under-prepares Biovigilance or Histocompatibility and Tissue Banking, each worth just 1%.
Clinical Practice (14%)
This domain covers the day-to-day decision-making of transfusion medicine consultation - indications for transfusion, dosing, patient-specific considerations, and the judgment calls that separate textbook knowledge from clinical application.
- Transfusion thresholds and indications across patient populations
- Consultative reasoning under incomplete information
- Integration with the practical antibody-panel material rather than isolated recall
Hematopoietic Progenitor Cell (HPC) Transplantation (11%)
The second-largest domain covers collection, processing, and clinical use of HPC products - an area that many general transfusion medicine rotations touch only lightly, making dedicated review essential.
- Apheresis-based and marrow-based collection differences
- Product processing, storage, and release criteria
- Clinical indications and complications in transplant recipients
For a domain-by-domain breakdown of what to actually study within each of the 15 areas, see BB/TM Exam Domains 2026: Complete Guide to All 15 Content Areas.
How the Exam Is Scored
BB/TM uses a criterion-referenced passing scaled score of 500 - not a fixed raw percentage correct. That means the number of questions you need to answer correctly to pass isn't a static target like "70%"; it's calibrated against the exam's difficulty and scaling methodology for that administration. Candidates preparing for this exam should stop looking for a magic raw percentage and instead focus on broad mastery across all 15 domains. Our detailed explanation of the scoring mechanics is in BB/TM Passing Score 2026: Exactly What You Need to Pass.
On outcomes: ABPath's 2025 Annual Report (released 2026) reported an overall BB/TM pass rate of 90% (44/49), with a first-time taker rate of 91% (39/43) and a repeat-taker rate of 83% (5/6). Those numbers reflect one reporting year and shouldn't be read as a guarantee, but they do suggest that well-prepared, fellowship-trained candidates pass at a high rate. A closer look at what drives that outcome - and what separates first-time passers from repeat takers - is in BB/TM Pass Rate 2026: What the Data Shows and How Hard Is the BB/TM Exam? Complete Difficulty Guide 2026.
Keeping BB/TM Certification Active
ABPath certificates carry no fixed expiration date, but staying certified is contingent on participating in ABPath's Continuing Certification program. The standard route requires 70 CME credits per two-year reporting cycle, with at least 80% of those credits related to the diplomate's scope of practice. At least two improvement-in-practice or quality-assurance activities are required per two-year cycle, alongside ongoing licensure and professionalism requirements.
Separately, ABPath's CertLink program assigns 10-15 questions quarterly. Diplomates must complete the assigned questions and maintain at least 60% correct cumulatively across the four-year assessment period. These are maintenance requirements, entirely distinct from the initial certification exam's passing score - passing the exam gets you certified; CertLink and CME keep you certified.
Who Hires BB/TM-Certified Physicians
BB/TM-certified pathologists typically work as medical directors of hospital transfusion services and blood banks, as physicians affiliated with blood collection organizations, and within HPC transplant programs where clinical oversight of cellular therapy products is required. Academic medical centers, large hospital systems, and regional blood centers are common employers, often specifically because regulatory and accreditation frameworks call for physician oversight with documented subspecialty training in transfusion medicine.
The domain weighting in the exam mirrors this reality: heavy emphasis on Clinical Practice, RBC and platelet components, apheresis, and HPC transplantation reflects the actual scope of a transfusion medicine director's job, not just academic trivia. For a broader look at career paths and compensation considerations tied to this credential, see BB/TM Salary Guide 2026: Complete Earnings Analysis, BB/TM Jobs, and Is the BB/TM Certification Worth It? Complete ROI Analysis 2026.
BB/TM vs. SBB(ASCP)
It's worth being explicit about a distinction that causes real confusion: BB/TM (the ABPath physician subspecialty certification discussed throughout this article) is a completely separate credential from SBB(ASCP), the Specialist in Blood Banking certification offered by the American Society for Clinical Pathology's Board of Certification. SBB(ASCP) is a laboratory specialist credential aimed at medical laboratory professionals; BB/TM is a physician subspecialty certification requiring a medical degree, primary board certification, and fellowship training. They serve different roles in the transfusion medicine field and have entirely different eligibility pathways, exam structures, and governing bodies. If you're researching credentials in this space, confirming which one you actually need before you start studying will save significant time.
A Practical Way to Prepare
Given the domain weighting, a reasonable study sequence front-loads the heaviest domains early, while there's still time to revisit weak spots, and saves the lightest domains (Biovigilance, Histocompatibility and Tissue Banking) for shorter review sessions closer to test day.
Clinical Practice & RBCs/RBC Components
- Work through transfusion indication scenarios, not just definitions
- Drill antibody-identification panels daily to build pattern recognition
HPC Transplantation & Hazards of Transfusion
- Map collection-to-infusion workflow for HPC products
- Review adverse event classifications and management protocols
Apheresis, Platelets, Plasma, Surgery & OB/Peds Patients
- Practice calculation-based questions (dosing, volumes, formulas)
- Review special population considerations for surgical and obstetric transfusion
Lower-weight domains & full timed practice
- Cover Biovigilance, Histocompatibility, Management/Informatics, and Regulatory topics
- Run full-length timed practice sessions to build stamina for the long test day
A full weekly breakdown with more granular task lists is available in the BB/TM Study Guide 2026: How to Pass on Your First Attempt, and a condensed reference for last-minute review is in the BB/TM Cheat Sheet 2026: One-Page Review of Must-Know Facts. Practicing with realistic, timed, single-best-answer questions on our practice test platform before test day helps build the pacing needed to move through 280 questions across six sections without running out of time.
Frequently Asked Questions
No. BB/TM is ABPath's physician subspecialty certification requiring a medical degree, primary board certification, and fellowship training. SBB(ASCP) is a separate laboratory specialist credential for medical laboratory professionals, issued by a different certifying body.
The exam has 280 single-best-answer multiple-choice questions delivered in a one-day, computer-based format at Pearson VUE Professional Testing Centers, combining written and practical material across six sections.
Passing requires a criterion-referenced scaled score of 500. There is no fixed raw percentage of correct answers required, since scoring is calibrated to each exam administration.
Candidates need AP/CP or CP primary certification (or primary certification from another ABMS member board) plus 12 months of ACGME-accredited Blood Banking/Transfusion Medicine fellowship training. A qualifying medical degree, program verification, and a full unrestricted medical license are required for certification.
Certificates have no fixed expiration date, but remaining certified depends on meeting ABPath's Continuing Certification requirements, including CME credits, improvement-in-practice activities, and ongoing CertLink participation.