What Is PBSE?

What PBSE Actually Is

PBSE stands for the Perfusion Basic Science Examination. It is the first of two examinations administered by the American Board of Cardiovascular Perfusion (ABCP) on the road to the Certified Clinical Perfusionist (CCP) credential. If you searched for the acronym and landed here, note the identity carefully: this site covers the ABCP perfusion examination and nothing else that happens to share the same four letters.

Conceptually, PBSE tests whether a perfusion graduate understands the science underneath the practice: the physiology a heart-lung machine is replacing, the pharmacology used around bypass, the pathology of patients who need it, and the laboratory values that guide decisions. It is a written, computer-delivered, multiple-choice examination rather than a hands-on skills assessment.

If you want a quick vocabulary primer before going deeper, our short explainers on what PBSE stands for and the meaning of PBSE cover the terminology, while this article walks through the whole examination end to end.

Where PBSE Fits in the CCP Pathway

Perfusion certification through the ABCP is a two-part process. PBSE is Part I. The Clinical Applications in Perfusion Examination (CAPE) is Part II. They are separate examinations with separate four-hour timers, and the CCP is awarded only after both are passed.

The two examinations draw on the same official knowledge-base headings. The difference is emphasis: PBSE leans toward basic-science processes (why things happen), while CAPE leans toward application (what you do about it). Candidates who treat the two as completely different subjects tend to study inefficiently; the shared structure means the same domain headings recur across both parts. For a fuller look at the credential as a whole, see our overview of PBSE certification.

Format, Timing and Delivery

The basics

• Item type: multiple-choice questions
• Length: approximately 220 items (an approximation, not a guaranteed exact count)
• Time limit: four hours
• Delivery: Pearson VUE test centers, with Professional Testing, Inc. (PTI) supporting development and administration
• Identification: matching, original, unexpired government-issued photo ID is required

The Fall 2026 change to block delivery

Starting with the Fall 2026 administration, the examination is delivered in blocks, and candidates cannot return to a block once it has been submitted. Total testing time and the approximate item count are unchanged. No official block size has been published in the sources we verified, so be wary of any prep material that claims a specific number of questions per block.

The practical consequence is a change in test-day habits. Under a free-navigation format, many candidates skip hard items and circle back. With submitted blocks, you must make your best decision on every item before you close the block. Practice answering decisively, flagging within a block only for the time you will actually have before submission.

The 11 Knowledge-Base Domains

The scope of PBSE is defined by 11 knowledge-base headings published in the ABCP's 2026 Examination Guidebook. These are official examination headings shared with CAPE, not an editorial study plan. The ABCP does not publish a verified percentage distribution across them, so no domain can honestly be called "the biggest." Treat all 11 as eligible for testing. The knowledge-base survey underlying them was last conducted in 2023.

Because there is no verified weighting, we recommend learning how the domains interlock rather than ranking them. A single question can touch several headings at once: an anticoagulation scenario involves pharmacology, laboratory analysis and clinical management together. Our complete guide to all 11 content areas goes deeper on each heading.

Who Can Sit for PBSE

Eligibility normally requires graduation from an accredited perfusion program before the examination date. Applicants may apply while still enrolled, provided graduation precedes the exam. A complete application involves an official graduation transcript, a school statement of clinical competency, and a documented case record. Limited historic exceptions exist for people who entered training before April 15, 1981 and for previously certified perfusionists.

The case-record detail that trips people up

The detailed guidebook criteria require at least 75 qualifying primary clinical perfusion activities. In the guidebook's detailed accounting, that means:

• At least 70 primary cardiopulmonary bypass (CPB) cases, plus
• Five qualifying cases of 3P ECMO or 6P VAD support
• At least 10 pediatric CPB cases performed or observed. Performed pediatric cases may overlap the 75, but observed cases cannot count toward the 75.

Cases must take place in the United States, its territories, or Canada, and an ABCP-certified CCP instructor must be physically present during CPB cases. Effective November 1, 2025, submitted records must show the instructor's full first and last name and CCP number, including the overseeing CCP for ECMO and VAD cases.

For a step-by-step breakdown, see our guide to PBSE requirements and how to qualify.

Fees, Windows and Registration Mechanics

The cost story extends beyond the fee itself, since training, travel and time off all add up. Our PBSE certification cost breakdown separates the published fee from those surrounding expenses.

The Fall 2026 calendar

The current ABCP calendar lists the Fall 2026 window as October 20-24, 2026. An older figure in the 2025 Annual Report lists October 21-24; the current calendar takes precedence. Applications for that window closed on October 5, 2026, with the late fee applying after September 21. In other words, as of mid-October 2026 the fall application window is no longer open to new applicants.

Looking ahead, the January and July 2027 pilot windows are restricted to eligible retesting candidates and qualifying CAPE holdovers who already have prior-window applications on file. They are not open to unrestricted new PBSE applicants. The regular spring and fall windows remain the standard path. For deadlines and scheduling, see PBSE exam dates and testing windows.

Scoring, Results and Published Pass Data

How the score works

The passing score is a scaled 400 on a 120-480 scale, set by a criterion-referenced standard. That means you are measured against a fixed competence standard, not against other candidates, and there is no grading curve. The ABCP does not publish a raw-percentage rule, so avoid sources claiming "you need X percent correct." A preliminary pass/fail result is issued at the test center, with final verified results provided within six weeks. Details are in our PBSE passing score explainer.

What the 2025 results show

The ABCP 2025 Annual Report publishes PBSE results by administration and by candidate cohort. These should be read together, not blended into a single number.

Two cautions apply. First, these are PBSE figures only, not CAPE results. Second, they describe 2025 administrations and are not a single 2026 pass rate. The Spring cohort is small (43 first-time candidates), so percentages swing widely on a handful of people, and the Fall cohort is much larger. Repeat candidates passed at lower rates in both administrations, which is a useful reminder that a retake needs a changed preparation strategy, not just more of the same. We dig into interpretation in what the pass-rate data shows and in how hard the PBSE exam really is.

Careers, Pay and What PBSE Does Not Guarantee

Perfusionists work primarily in hospital cardiac surgery programs, operating alongside surgeons, anesthesiologists and nurses to run the heart-lung machine and related extracorporeal support. Employers are typically hospitals and health systems with cardiac surgery services, along with perfusion service companies that staff them.

On compensation, be careful. No PBSE-specific salary premium has been verified. Perfusionist pay is shaped by the occupation, geography, call coverage and experience, and it should not be attributed to passing one part of the examination. Likewise, a return-on-investment calculation has to separate occupational pay, call pay, training costs, and the eventual CCP credential. Our salary analysis and ROI discussion treat those pieces separately, and if you are exploring roles, see PBSE-related jobs.

After PBSE: CAPE and Maintaining the CCP

Once PBSE is passed, the next step is CAPE. After both examinations are passed and the CCP is awarded, the credential must be maintained. PBSE itself is not renewable; maintenance applies to the CCP.

Standard CCP maintenance

• Clinical activity: 40 activities annually, including at least 25 primary and no more than 15 secondary
• Professional activity: 45 CEUs per three-year cycle, including at least 15 Category I CEUs
• Reporting: periods end June 30, with reports due July 31

The first cycle for newly certified CCPs

For new CCPs certified in the fall, the first reporting cycle requires 20 clinical activities, including at least 13 primary and no more than seven secondary. The standard 40-activity requirement resumes afterward. Professional-activity CEU requirements are not prorated in the first cycle. These are CCP maintenance rules drawn from the live recertification pages, not additional PBSE content domains. (A separate Booklet of Information shows conflicting version labels, so we follow the live recertification pages.)

A Domain-Driven Preparation Sequence

Because the official headings are unweighted, a sensible sequence builds from foundations toward the situations that depend on them. Here is one way to schedule the 11 domains over several weeks; adjust for your own strengths and for the block format discussed above.

For a full methodology and resource list, read our PBSE study guide, keep the one-page cheat sheet handy for last-minute review, and drill with realistic questions on our PBSE practice test site. If you are weighing structured coursework, our note on PBSE training outlines the options.

Frequently Asked Questions