- What Is the ACRP-PI (CPI) Exam?
- Exam Format Breakdown: Questions, Time, and Delivery
- Scoring Mechanics and What 600 Actually Means
- The Six Exam Domains and Their Weights
- Domain Deep Dives: What You Must Actually Know
- Registration, Fees, and Scheduling
- The ICH E6(R3) Change Taking Effect July 2026
- Structuring Your Preparation Around Domain Weights
- Credential Maintenance After You Pass
- Frequently Asked Questions
- The exam has 125 multiple-choice questions and a 180-minute time limit, with a scaled passing score of 600.
- Ethical and Safety Considerations is the highest-weighted domain at 22%; Clinical Trial Operations follows at 21%.
- ICH E6(R3) replaces E6(R2) on the exam beginning July 15, 2026 - know which version applies to your test date.
- Early-bird ACRP member fees start at $435; non-members pay up to $600 at the regular rate.
What Is the ACRP-PI (CPI) Exam?
The Certified Principal Investigator (CPI) credential is administered by the Association of Clinical Research Professionals (ACRP). On this site we use the label ACRP-PI to reflect the role itself, but the official designation you'll display after your name is CPI. It is one of the most role-specific credentials available to physicians, licensed independent practitioners, and sub-investigators who lead or are building toward leading clinical trials.
Unlike broader clinical research certifications, the CPI is designed specifically for the person who signs the Form FDA 1572 (or its international equivalent), bears ultimate responsibility for the conduct of the trial at the site level, and must demonstrate competency across everything from protocol design rationale to adverse event reporting. That scope is reflected directly in how the exam is built.
Because this is an ICH-only exam, it is not country-specific. Questions are written against internationally harmonized guidance - particularly ICH E6 Good Clinical Practice - rather than the regulations of any single national authority. That matters enormously for how you study: you need fluency in the GCP framework, not memorization of country-by-country regulatory codes.
Before diving into format details, make sure your eligibility is confirmed. The experience and documentation requirements are specific. You can review them in the ACRP-PI Eligibility Requirements: A Complete 2026 Guide, which covers the 3,000-hour threshold, the qualifying waiver to 1,500 hours, and the approved doctoral/licensed provider route versus the Sub-I route.
Exam Format Breakdown: Questions, Time, and Delivery
Total Questions and Item Type
The exam contains 125 multiple-choice questions. Not all of these questions count toward your score. A subset are unscored pretest items - new questions that ACRP is piloting for potential use in future versions of the exam. You will not be told which items are pretest and which are scored, so you must treat every question as if it counts.
All items are multiple-choice, which means each question has one best answer from a set of options. There are no drag-and-drop, hotspot, or constructed-response items. The question style tends to be scenario-based rather than simple recall: you'll be given a clinical situation and asked to identify the most appropriate PI action, the correct regulatory path, or the proper protocol deviation response. Pure memorization is insufficient.
Time Limit
Candidates have 180 minutes (three hours) to complete the exam. With 125 questions, that works out to approximately 86 seconds per question - a comfortable pace on straightforward items, but you'll want reserve time for the longer scenario-based questions that require reading a paragraph-length vignette before selecting your answer.
Testing Modalities
You can sit the exam either at a PSI in-person test center or via live remote proctoring through PSI's platform. Both modalities are equivalent in terms of content and scoring. The remote option requires a stable internet connection, a webcam, and a workspace that meets PSI's environmental requirements. The in-person option is worth considering if you find controlled environments helpful for focus or if your home workspace is difficult to clear.
An on-screen calculator and abbreviation resources are provided within the testing interface - you do not need to bring your own. No external reference materials are permitted.
Scoring Mechanics and What 600 Actually Means
The ACRP-PI exam uses scaled scoring. Your raw score - the number of scored questions you answer correctly - is converted to a scaled score using a psychometric process that accounts for slight differences in difficulty across different exam forms. The passing score is 600 on whatever scale ACRP uses for this exam.
Scaled scoring means you cannot simply calculate "I need to get X out of Y questions right." The conversion process is intentionally opaque to candidates, but the practical implication is straightforward: answer as many questions correctly as possible, because the scaling works in your favor on harder forms and doesn't reward guessing strategy over genuine knowledge.
After the exam, ACRP will send your official result. If you do not pass, your score report will include domain-level performance feedback, which is valuable for identifying where to focus a retake effort across the six content areas.
The Six Exam Domains and Their Weights
The 2024 CPI Exam Content Outline organizes the blueprint across six domains. These percentages represent how many scored questions come from each area and should drive how you allocate your preparation time.
| Domain | Weight | Priority Level |
|---|---|---|
| Domain 1: Scientific Rationale and Principles of Research Design | 15% | Moderate |
| Domain 2: Ethical and Safety Considerations | 22% | Highest |
| Domain 3: Product Development and Regulation | 12% | Moderate |
| Domain 4: Clinical Trial Operations | 21% | High |
| Domain 5: Study and Site Management | 17% | High |
| Domain 6: Data Management | 13% | Moderate |
Domains 2 and 4 together account for 43% of the exam. A candidate who performs exceptionally in those two areas and adequately across the remaining four is in a strong position to pass. That said, no domain is safe to ignore - Domain 3 at 12% still represents a meaningful slice of scored questions.
Domain Deep Dives: What You Must Actually Know
Domain 2: Ethical and Safety Considerations (22%)
This is the highest-weighted domain and the core of what distinguishes a PI from a coordinator or monitor. Expect questions on:
- Informed consent requirements, timing, and documentation - including re-consent triggers
- IRB/IEC submission requirements, continuing review, and expedited review categories
- Adverse event and serious adverse event definitions, PI reporting obligations, and timelines
- Vulnerable population protections (pediatric subjects, pregnant women, prisoners)
- The Belmont Report principles as applied to trial conduct scenarios
- PI responsibilities for subject safety monitoring between visits
Domain 4: Clinical Trial Operations (21%)
This domain tests how you actually run a trial from site activation through closeout. High-frequency topics include:
- Protocol deviation vs. protocol violation classification and required reporting
- Investigational product accountability, storage, and dispensing records
- Source document requirements and what constitutes an original versus a copy
- Sponsor-PI communication obligations and what to do when sponsor instructions conflict with GCP
- Monitoring visit preparation and response to monitor findings
- Screen failure and enrollment documentation
Domain 5: Study and Site Management (17%)
Questions here target PI-level oversight responsibilities at the site, not just execution tasks. Key areas:
- Delegation log requirements and the limits of what a PI can delegate
- Staff training documentation and GCP training currency
- Site audit preparation and response to findings from regulatory authorities
- Financial disclosure requirements and conflict of interest documentation
- Essential documents list from ICH E6 and proper filing in the Investigator Site File
Domain 1: Scientific Rationale and Principles of Research Design (15%)
This domain tests foundational research methodology as applied to clinical trial design. Focus on:
- Randomization methods and their bias-reduction purposes
- Blinding strategies (single, double, open-label) and when unblinding is permitted
- Phase I through Phase IV study designs and their respective objectives
- Endpoints: primary vs. secondary, surrogate endpoints, and clinical meaningfulness
- Statistical concepts relevant to PI oversight: sample size rationale and interim analysis
Domain 6: Data Management (13%) and Domain 3: Product Development and Regulation (12%)
These two supporting domains are often underestimated. For Domain 6, concentrate on electronic data capture systems, audit trail requirements, and query resolution responsibilities. For Domain 3, focus on the IND application process, sponsor vs. PI roles in product development, and how regulatory submissions flow - all from an ICH GCP lens rather than a country-specific regulatory pathway.
Registration, Fees, and Scheduling
Registration is handled through the ACRP website, with scheduling completed through PSI after your application is approved. Fee structure varies by membership status and when you register:
| Registration Window | ACRP Member | Non-Member |
|---|---|---|
| Early-Bird | $435 | $485 |
| Regular | $460 | $600 |
The difference between early-bird and regular pricing for a non-member is $115 - a meaningful incentive to plan ahead. ACRP membership also unlocks discounted access to preparation resources, which can offset a portion of the membership fee itself.
When scheduling through PSI, you'll select a test center location or configure your remote proctoring setup. PSI has extensive center availability globally, which aligns with the exam's international scope. Check seat availability early if you're targeting a specific test window around the July 15, 2026 ICH E6(R3) transition date (discussed in the next section).
Key Takeaway
If you're not currently an ACRP member, run the math before registering: the regular non-member fee is $600, while ACRP membership plus the early-bird member fee may come out lower depending on current membership rates. Check ACRP's site for the current membership pricing before you register.
The ICH E6(R3) Change Taking Effect July 2026
This is the single most important logistical fact for 2026 candidates: ICH E6(R3) replaces E6(R2) on the exam beginning July 15, 2026. If you sit the exam before that date, you are tested on E6(R2). If you sit on or after July 15, 2026, E6(R3) applies.
E6(R3) is a substantive revision, not a cosmetic update. It reorganizes the GCP principles, introduces updated language around risk-based approaches to quality management, and refines PI responsibilities in several areas including oversight of decentralized trial elements. Candidates targeting a post-July 2026 test date must study from the E6(R3) document directly.
If you are currently preparing and your test date straddles the transition window, the safest approach is to know both - understand where E6(R3) diverges from E6(R2) and map those differences to the domain areas most likely to be affected (particularly Domains 2 and 4). Practice questions referenced in our ACRP-PI practice test platform are updated to reflect the applicable version, so checking which content version a resource targets before using it is essential.
Structuring Your Preparation Around Domain Weights
A domain-weighted study schedule prevents the common mistake of spending equal time on a 12% domain and a 22% domain. Here is a six-week structure tied directly to the CPI content outline:
Domain 2: Ethical and Safety Considerations
- Read ICH E6(R3) Sections on PI responsibilities for subject protection
- Review IRB/IEC submission processes and adverse event reporting timelines
- Complete 30-40 practice questions focused on informed consent scenarios
Domain 4: Clinical Trial Operations
- Work through investigational product accountability scenarios
- Study protocol deviation classification and reporting workflows
- Practice 30-40 operations-focused scenario questions
Domain 5: Study and Site Management
- Map delegation log requirements to specific PI oversight tasks
- Review the ICH E6 essential documents list and ISF filing standards
- Study financial disclosure and audit response scenarios
Domain 1: Scientific Rationale + Domain 6: Data Management
- Cover study design phases, blinding, and randomization concepts
- Review EDC audit trail requirements and query resolution PI responsibilities
- Complete mixed practice sets across both domains
Domain 3: Product Development and Regulation + ICH E6(R3) Review
- Study IND process and sponsor-PI regulatory communication requirements
- If testing post-July 15, 2026: focus on E6(R3) changes versus E6(R2)
- Complete 40-50 questions spanning all six domains in mixed order
Full-Length Simulation and Weak Domain Reinforcement
- Take at least one full 125-question timed simulation at the practice test platform
- Identify any domain-level gaps from simulation results and do targeted review
- Review abbreviation resources you'll have access to on exam day
The front-loading of Domains 2 and 4 is intentional: these two areas account for 43% of the exam, and gaining fluency early gives you more time to revisit weak spots through practice questions in weeks 5 and 6.
Credential Maintenance After You Pass
Earning the CPI is not a one-time event. The credential must be maintained on a two-year renewal cycle, requiring 24 maintenance points per period. Points are earned through continuing education activities, ACRP-approved events, and other qualifying professional development activities.
Planning your maintenance activities from the start of your certification period - rather than scrambling at the end of year two - keeps the credential current without a last-minute rush. ACRP provides a portal for tracking your maintenance points, and many national and regional clinical research conferences offer bulk-point opportunities.
For a full picture of the eligibility requirements that brought you to the exam in the first place, and to cross-reference the documentation you'll need to maintain on file, revisit the ACRP-PI Eligibility Requirements: A Complete 2026 Guide.
Frequently Asked Questions
The exam contains 125 multiple-choice questions, with a time limit of 180 minutes. Some of those questions are unscored pretest items - you won't know which ones - so treat all 125 questions as scored.
The passing score is a scaled score of 600. ACRP uses scaled scoring to account for variation in difficulty across exam forms, so your raw number correct is converted before comparison to the passing threshold.
Yes. ICH E6(R3) replaces E6(R2) as the applicable GCP guidance document on the exam beginning July 15, 2026. If your test date is before that date, study E6(R2). If your test date is on or after July 15, 2026, study E6(R3). The two versions differ meaningfully in several areas relevant to PI responsibilities.
Domain 2: Ethical and Safety Considerations is weighted at 22%, making it the highest-weighted domain on the exam. Domain 4: Clinical Trial Operations follows at 21%. Together these two domains represent nearly half of your scored questions and should receive the most preparation time.
Yes. PSI offers live remote proctoring as an alternative to in-person test centers. Both options deliver the same exam content under the same conditions. You'll need a reliable internet connection, a webcam, and a workspace that meets PSI's environmental requirements for the remote option. Visit the ACRP-PI Exam Prep practice platform to simulate test conditions before your scheduled date regardless of which modality you choose.