- What BB/TM Actually Stands For
- Who Grants the Certification
- Who Can Sit for the Exam
- Exam Format: 280 Questions, One Day
- The 15 Content Domains
- 2026 Fees and Testing Window
- How the Exam Is Scored
- Keeping Certification: CertLink and CME
- BB/TM vs. SBB(ASCP): Not the Same Credential
- Who Hires BB/TM-Certified Pathologists
- Building a BB/TM-Specific Prep Plan
- Frequently Asked Questions
- BB/TM is the American Board of Pathology's subspecialty certification in Blood Banking/Transfusion Medicine.
- The 2026 exam has 280 single-best-answer questions across six combined written/practical sections.
- Testing runs September 8-28, 2026, at Pearson VUE centers, with a $2,100 fee including a $200 nonrefundable portion.
- Passing requires a scaled score of 500 - not a fixed raw percentage.
What BB/TM Actually Stands For
BB/TM stands for Blood Banking/Transfusion Medicine, and in the context of this site it refers specifically to the initial subspecialty certification offered through the American Board of Pathology (ABPath). This is a physician credential earned by pathologists who complete dedicated fellowship training in transfusion medicine and then pass a rigorous, standardized examination. It is not a generic industry acronym - it is a formally defined subspecialty certification with its own eligibility pathway, content specification, and maintenance requirements.
If you've landed here searching "what is a BB/TM," you're likely a pathology resident, a fellow, or someone advising one, trying to understand exactly what this credential involves before committing a year of fellowship and a testing fee to it. For a deeper dive into terminology, see BB/TM Meaning and What Does BB/TM Stand For?
Who Grants the Certification
The American Board of Pathology (ABPath) is the certifying body. ABPath administers this as an initial subspecialty certification, meaning candidates must already hold primary board certification before they're eligible to pursue BB/TM. This is a subspecialty layered on top of an existing pathology credential, not a standalone entry-level exam.
Because ABPath controls the content specification, eligibility rules, exam schedule, and fee structure, every factual detail in this article - dates, fees, question counts, domain weights - is sourced directly from ABPath's own published materials for the 2026 cycle.
Who Can Sit for the Exam
Eligibility for BB/TM has two main components:
- Primary certification: Candidates must hold AP/CP or CP primary certification from ABPath, or primary certification from another ABMS member board.
- Fellowship training: Twelve months of ACGME-accredited Blood Banking/Transfusion Medicine fellowship training is required.
Beyond these two pillars, candidates need a qualifying medical degree, program verification confirming completed training, and a full unrestricted medical license. There is no shortcut around the fellowship year - it is the structural backbone of eligibility. For the complete breakdown of documentation and timing, see BB/TM Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Exam Format: 280 Questions, One Day
The BB/TM exam is a one-day, computer-based test delivered at Pearson VUE Professional Testing Centers. It consists of 280 single-best-answer multiple-choice questions, combining written and practical material across six sections. "Practical" material here means antibody-identification panels, images, charts, graphs, tables, diagrams, formulas, and calculations - not a hands-on bench exam, but questions that require interpreting visual and quantitative data the way a transfusion medicine physician would in practice.
The 2026 schedule allocates six hours and 22 minutes of actual testing time. The full scheduled day, including tutorial, survey, lunch, and other breaks, runs eight hours and 52 minutes. Candidates should plan their travel and rest around a full working day at the test center, not just the testing time itself.
Key Takeaway
Because practical items include antibody panels and calculations mixed into the same 280-question pool, candidates can't separate "written study" from "practical study" the way some other boards allow - every domain should be practiced with both recall questions and applied data-interpretation questions.
The 15 Content Domains
The 2026 examination blueprint, dated January 2026, organizes content into 15 domains with published approximate weights that total 100%. Clinical Practice is the largest single domain, followed by Hematopoietic Progenitor Cell Transplantation.
Domain 1: Clinical Practice (14%)
The single largest domain. Covers the clinical decision-making side of transfusion medicine - indications, consultation, and patient management.
- Highest-yield domain by weight; deserves proportionally more study time
Domain 14: Hematopoietic Progenitor Cell (HPC) Transplantation (11%)
The second-largest domain, covering stem cell collection, processing, and transplant-related transfusion support.
- Often underprepared by candidates whose fellowship emphasized transfusion over cellular therapy
Domain 3 & Domain 5: RBCs/RBC Components and Hazards of Transfusion (10% each)
Two of the heaviest-weighted domains. RBC components covers storage, compatibility, and component modification; adverse events covers acute and delayed transfusion reactions.
- Together these represent a fifth of the exam
The remaining domains - Apheresis (8%), Blood Donors and Blood Collection (7%), Surgery Patients (7%), Obstetric and Pediatric Patients (7%), Plasma Components and Derivatives (6%), Platelet and Platelet Components (6%), Management/Quality/Legal/Regulatory (6%), Infectious Hazards of Transfusion (4%), Management and Informatics-General (2%), Histocompatibility and Tissue Banking (1%), and Biovigilance (1%) - round out the blueprint. None of these are safe to skip; even the 1%-weighted domains show up as scored items.
For a full domain-by-domain breakdown with subtopics, weighting rationale, and study sequencing, see BB/TM Exam Domains 2026: Complete Guide to All 15 Content Areas.
| Domain | Approx. Weight |
|---|---|
| Clinical Practice | 14% |
| HPC Transplantation | 11% |
| RBCs and RBC Components | 10% |
| Hazards of Transfusion (Specific Adverse Events) | 10% |
| Apheresis | 8% |
| Blood Donors and Blood Collection | 7% |
| Surgery Patients | 7% |
| Obstetric and Pediatric Patients | 7% |
| Plasma Components and Derivatives | 6% |
| Platelet and Platelet Components | 6% |
| Management, Quality, Legal & Regulatory Issues | 6% |
| Infectious Hazards of Transfusion | 4% |
| Management and Informatics-General | 2% |
| Histocompatibility and Tissue Banking | 1% |
| Biovigilance | 1% |
2026 Fees and Testing Window
The 2026 examination fee is $2,100, which includes a $200 nonrefundable administrative fee. Testing occurs during a defined window: September 8-28, 2026, at Pearson VUE Professional Testing Centers. Candidates schedule an individual appointment within that window rather than sitting for a single fixed exam date shared by everyone.
Because the administrative fee is nonrefundable regardless of outcome, candidates should confirm eligibility documentation - primary certification status, fellowship verification, and license status - well before submitting an application. For the full cost breakdown, including what the fee does and does not cover, see BB/TM Certification Cost 2026: Complete Pricing Breakdown. For scheduling logistics and deadlines, see BB/TM Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
How the Exam Is Scored
BB/TM uses a criterion-referenced passing scaled score of 500 - not a fixed raw percentage of correct answers. This means the passing threshold is calibrated based on question difficulty for that exam form, so "70% correct" or similar rules of thumb don't map cleanly onto this test. A detailed explanation of what the scaled score means and how it differs from raw scoring lives at BB/TM Passing Score 2026: Exactly What You Need to Pass.
According to ABPath's 2025 Annual Report (released 2026), the overall pass rate that year was 90% (44/49 candidates), with a first-time pass rate of 91% (39/43) and a repeat-taker rate of 83% (5/6). These figures reflect a single reporting year and a relatively small candidate pool, which is worth keeping in mind when interpreting them. A fuller discussion of what these numbers do and don't tell you is available at BB/TM Pass Rate 2026: What the Data Shows, and a broader difficulty assessment is covered in How Hard Is the BB/TM Exam? Complete Difficulty Guide 2026.
Keeping Certification: CertLink and CME
Unlike some credentials that expire on a fixed cycle, BB/TM certificates have no fixed expiration date. Instead, ongoing validity is contingent on participation in ABPath's Continuing Certification program. This has two main components:
- CME requirement: 70 credits per two-year reporting cycle, with at least 80% related to the diplomate's scope of practice, plus at least two improvement-in-practice or quality-assurance activities per cycle.
- CertLink assessment: A longitudinal question-based assessment that assigns 10-15 questions quarterly. Diplomates must complete assigned questions and maintain at least 60% correct cumulatively over the four-year assessment period.
Licensure and professionalism requirements apply alongside these. These maintenance obligations are entirely separate from the initial exam passing score - passing the exam gets you certified, but staying certified is an ongoing, multi-year commitment. Understanding this up front matters when evaluating whether the credential fits your career plans; see Is the BB/TM Certification Worth It? Complete ROI Analysis 2026 for a fuller cost-benefit view.
BB/TM vs. SBB(ASCP): Not the Same Credential
A common point of confusion is conflating this physician subspecialty certification with the SBB(ASCP) - Specialist in Blood Banking - credential offered through the American Society for Clinical Pathology's Board of Certification. SBB(ASCP) is a laboratory specialist certification aimed at medical laboratory scientists and technologists working in blood bank operations. It has different eligibility requirements, a different certifying body, and a different exam entirely.
BB/TM, as covered on this site, is a physician credential requiring primary board certification in pathology (or another ABMS specialty) plus a full year of ACGME-accredited fellowship training. If you're researching career paths, make sure you're reading about the right credential for your role - a pathologist pursuing subspecialty certification and a medical technologist pursuing specialist certification are on entirely different tracks, even though both use overlapping terminology.
Who Hires BB/TM-Certified Pathologists
BB/TM certification signals to employers that a pathologist has demonstrated subspecialty-level competency across the full scope of transfusion medicine practice - from donor collection and component preparation through complex clinical consultation for surgery, obstetric, and transplant patients. This credential typically matters most for pathologists pursuing roles such as:
- Hospital and health-system transfusion medicine directors
- Blood center medical directors overseeing donor and collection operations
- Academic medical center transfusion medicine consultants
- Physicians supporting apheresis programs and HPC transplant services
Because Clinical Practice and HPC Transplantation together account for a quarter of the exam's weighting, it's a reasonable proxy for the kinds of clinical consultation and transplant-support work these roles actually require day to day. For context on how this credential translates into compensation, see BB/TM Salary Guide 2026: Complete Earnings Analysis, and for the broader job landscape, BB/TM Jobs.
Building a BB/TM-Specific Prep Plan
Generic study techniques - spaced repetition, active recall, timed practice blocks - work, but only when they're mapped onto the actual blueprint weighting. A prep schedule that spends equal time on Biovigilance (1%) and Clinical Practice (14%) is misallocating effort. A more sensible approach sequences study blocks by domain weight, tackling the heaviest domains earliest so there's time to revisit them before test day.
Clinical Practice + RBCs/RBC Components
- Cover the two heaviest low-hanging domains first while energy and time are highest
- Mix recall questions with antibody-panel and calculation-style practice items
HPC Transplantation + Hazards of Transfusion
- Build familiarity with transplant-support workflows and adverse-event classification
- Practice interpreting charts and graphs, since these domains lean on practical-format items
Apheresis, Surgery, OB/Pediatric, Donor Collection
- Cover the mid-weighted clinical-context domains together since they overlap in patient-management logic
Lower-weighted domains + full mixed review
- Don't skip Biovigilance, Histocompatibility, or Informatics - they still appear as scored items
- Run full-length practice sets combining written and practical formats
For a complete week-by-week plan built around this exact blueprint, see BB/TM Study Guide 2026: How to Pass on Your First Attempt. And when you're ready to test your recall against realistic question formats, practice tests built around the current blueprint are one of the most efficient ways to find weak domains before exam day.
Key Takeaway
Allocate study time proportionally to domain weight, but never skip a domain entirely - even 1%-weighted content areas appear as scored questions on the 280-item exam.
Beyond structured study time, using a dedicated practice test platform lets you simulate the mixed written/practical question style - including antibody panels and calculation items - rather than relying only on textbook review. Repeated exposure to that specific question format matters more for this exam than for a purely written-format test.
Frequently Asked Questions
It is the American Board of Pathology's initial subspecialty certification in Blood Banking/Transfusion Medicine, earned by pathologists who complete a 12-month ACGME-accredited fellowship and pass a one-day, 280-question computer-based exam.
The 2026 examination fee is $2,100, which includes a $200 nonrefundable administrative fee. See BB/TM Certification Cost 2026 for the full breakdown.
Passing requires a criterion-referenced scaled score of 500, not a fixed raw percentage. Details are covered in BB/TM Passing Score 2026.
No fixed expiration date exists, but certification remains valid only through ongoing participation in ABPath Continuing Certification, including CertLink quarterly assessments and a 70-credit CME cycle every two years.
No. BB/TM is a physician subspecialty certification from the American Board of Pathology requiring fellowship training. SBB(ASCP) is a separate laboratory specialist certification for medical technologists through ASCP's Board of Certification.