PA-CN Exam Domains 2026: Complete Guide to All 11 Content Areas

What the NCCPA Nephrology CAQ Blueprint Actually Covers

The credential discussed on this site as "PA-CN" is, officially, the Certificate of Added Qualifications in Nephrology issued by the National Commission on Certification of Physician Assistants (NCCPA). Successful candidates may use the designation PA-C, CAQ-Neph. It is a specialty add-on for certified PAs, not initial PA-C certification, a nursing credential, or a physician nephrology board exam. If you are still sorting out terminology, our explainer What Is PA-CN Certification? covers the naming in detail.

The scope of the exam is defined by a three-page NCCPA document, the Content Blueprint for the Nephrology CAQ Examination. It lists eleven medical content categories, each with illustrative examples beneath it. Those examples are just that: illustrations, not exhaustive checklists. Treat each domain as a territory to master clinically rather than a list of facts to memorize.

One point deserves emphasis because it trips up many candidates: the eleven domains are official medical content categories, not preparation-curriculum headings. They describe what the exam tests, not how a course should be organized. A good study plan can slice the material differently, as long as it covers everything the blueprint lists. For the broader preparation picture, see the PA-CN Study Guide.

The Eleven Domains and Their Weights at a Glance

The table below reproduces the blueprint's medical content weights in descending order, with a quick note on what each domain tends to demand.

The weights sum to 100%. Notice how top-heavy the distribution is: the first four rows account for 62% of the medical content, and the first five reach 72%. That asymmetry should shape where your hours go, as we discuss in the sequencing section below.

The Four Heavy Domains: 62% of the Exam

Domain 1: Chronic Kidney Disease (20%)

This is the single largest category, and the blueprint heading is exactly "Chronic Kidney Disease." You may see third-party summaries label this 20% category differently (one commercial listing calls it "Chronic Dialysis"). Follow the NCCPA's wording: the issuer's own document is the authority, and chronic dialysis care belongs to the separate ESRD/Dialysis domain.

Domain 10: End-Stage Renal Disease / Dialysis (17%)

The second-largest domain is where hemodialysis and peritoneal dialysis knowledge lives. Candidates who work mostly in outpatient CKD clinics sometimes underweight this area, which is a mistake given its 17% share.

Domain 8: Renal Pathophysiology (14%)

This domain rewards mechanism. Questions here often ask why something happens: how a tubular transport defect produces an electrolyte pattern, or how a hemodynamic change alters filtration. Memorized treatment algorithms will not carry you through these items.

Domain 9: Acute Kidney Injury/Intensive Care Unit Nephrology (11%)

This domain shifts the setting to the hospital. Acute injury questions typically hinge on distinguishing causes and choosing the next best step quickly.

Hypertension and the Mid-Weight Domains

Domain 7: Hypertension (10%)

Hypertension sits alone as the fifth-largest domain, and it connects tightly to the CKD domain. Expect questions on evaluating secondary causes, resistant hypertension, and choosing agents appropriately in patients with reduced kidney function. Because the same drug-class knowledge feeds both CKD and hypertension items, studying them together is efficient.

Domain 2: Glomerular Disorders (6%)

Glomerular disease questions reward pattern recognition: nephrotic versus nephritic presentations, the serologic and urinary clues that point toward a specific diagnosis, and when biopsy changes management. Build a comparison framework rather than memorizing each entity in isolation.

Domain 5: Systemic Disorders (6%)

Here the kidney is a victim of a broader disease. Think diabetes, autoimmune and vasculitic conditions, and other multisystem processes that produce renal manifestations. The skill being tested is recognizing the renal consequence of a systemic illness and managing both.

The Smaller Domains That Still Cost Points

The remaining four domains total only 16% of the medical content, but they are not throwaways. Questions in small domains are often more specialized, and candidates who ignore them lose points they could have secured with modest effort.

The Second Lens: Task Categories Across the Same Exam

The NCCPA blueprint also presents a separate distribution by clinical task. This is where many candidates make a mathematical error, so read carefully: the task categories are not six extra domains. They cross-classify the same questions. A single item might be, for example, a Chronic Kidney Disease question (medical content) that also counts as a Managing Patients question (task). The two sets of percentages describe the same 120 questions from different angles, so they must never be added together or treated as additional content.

What does this tell you? Management dominates. At 35%, Managing Patients is the largest task category, and it bundles health maintenance, clinical intervention, and pharmaceutical therapeutics. Combined with Diagnosis (25%) and Diagnostic Studies (20%), you can see that the exam leans toward clinical decision-making rather than pure recall. Do not combine the 35% management figure with any medical-content weight; they measure different things.

Exam Format and Registration Mechanics

Understanding the delivery format helps you practice under realistic conditions.

• Length and structure: 120 multiple-choice questions, delivered as two 60-question blocks with 60 minutes per block.
• Timing details: The two-hour exam timer excludes a 15-minute tutorial and a 15-minute break.
• Closed book: Personal calculators, notes, and books are prohibited for initial testing.
• No backtracking across blocks: Questions in a finished block cannot be revisited, so pace yourself and commit to answers before time expires.
• Testing provider: Pearson VUE test centers for initial testing.
• Fee: $350 total, comprising $100 for registration/administration and $250 for the examination. A full breakdown lives in PA-CN Certification Cost.

Eligibility is its own topic, but one point is worth stating precisely here because it is commonly misread: candidates need 4,000 hours of total PA practice, including at least 2,000 hours in nephrology, within six years before attesting that the experience requirement is satisfied. It is not 4,000 nephrology hours. Candidates also need 75 nephrology-focused Category I CME credits in the six years before exam application, with at least 25 in the preceding two years. A collaborating physician or lead/senior PA in nephrology provides the attestation. Full detail is in PA-CN Requirements, and scheduling specifics are in PA-CN Exam Dates.

Scores generally arrive eight to ten weeks after administration following validation. A numeric passing threshold and an official specialty-specific pass rate have not been verified, so be skeptical of any source that quotes them or promises a guaranteed pass. Our pages on the passing score and pass rate explain what is and is not known.

Sequencing the Domains in a Study Plan

This is the one place where scheduling logic matters more than generic technique. The sequence below follows the blueprint weights and the natural dependencies between topics. Adjust the length to your timeline.

Notice the logic: foundational physiology first, then the heaviest clinical domains, then the specialized ones. For a fuller preparation framework, return to the PA-CN Study Guide, and keep the PA-CN Cheat Sheet handy for final-week review.

Official Practice Material and Source Conflicts to Watch

Start with what the NCCPA itself publishes. The Sample Nephrology Questions & Critiques document (copyright 2024) shows the question style and the reasoning behind correct answers, which is more valuable than raw question volume. The NCCPA also sells an optional $50 practice exam: one practice form is listed for this specialty, with a 180-day completion window. Its feedback is educational and does not predict whether you will pass, so use it to find weak domains rather than to forecast your result.

When you supplement with outside material, you will encounter some conflicts. Two worth flagging:

• Domain labels: As noted above, at least one third-party summary renames the 20% category "Chronic Dialysis." The issuer's heading is Chronic Kidney Disease. Study to the NCCPA's wording.
• Older CME figures: Some summaries cite a 150-credit CME requirement. Use the current NCCPA figures instead (75 credits for initial eligibility; 125 for renewal).

If you are weighing whether the investment makes sense, our analyses of whether the certification is worth it, the salary picture, and PA-CN jobs take a careful look without assuming the credential alone raises pay. When you are ready to test yourself on realistic questions, head to our PA-CN practice test platform, where you can work through domain-focused questions and review rationales.

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