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Study strategy
USMLE Step 2 CK Syllabus: The Complete Content Outline
The official USMLE Step 2 CK content outline broken down by content area, clinical science and physician task, with exact percentage ranges from USMLE.org.
By MedPrep Institute Editorial Team · Published · 9 min read
“Syllabus” isn’t the official term, but it’s what most students mean when they ask what Step 2 CK actually covers. The real document is the USMLE Step 2 CK Content Outline, published directly by the NBME and FSMB, and it breaks the exam down three different ways at once: by content area, by clinical science (rotation), and by physician task. This guide walks through all three, with the exact percentage ranges from the official outline.
What the Step 2 CK syllabus actually is
Every Step 2 CK question is tagged along three separate axes simultaneously: a content area (an organ system or a cross-cutting area like Nutrition or Social Sciences), a clinical science (which core rotation the scenario comes from), and a physician task (what kind of clinical reasoning or management decision it’s testing). A single question about managing a patient with new atrial fibrillation could count toward the cardiovascular system, Medicine as a clinical science, and pharmacotherapy as a physician task, all at once.
The systems breakdown
The content area breakdown tells you which organ systems and cross-cutting areas get the most questions, regardless of which rotation the scenario is drawn from.
USMLE Step 2 CK content outline: content areas
| Content area | Percentage of exam |
|---|---|
| Nutrition | 15-20% |
| Social Sciences: Legal/Ethical Issues & Professionalism/Systems-based Practice & Patient Safety | 10-15% |
| Renal & Urinary System & Reproductive Systems | 7-13% |
| Cardiovascular System | 6-12% |
| Musculoskeletal System/Skin & Subcutaneous Tissue | 6-12% |
| Behavioral Health | 5-10% |
| Blood & Lymphoreticular/Immune Systems | 5-10% |
| Gastrointestinal System | 5-10% |
| Nervous System & Special Senses | 5-10% |
| Respiratory System | 5-10% |
| Multisystem Processes & Disorders | 4-8% |
| Endocrine System | 3-7% |
| Pregnancy, Childbirth & the Puerperium | 3-7% |
| Biostatistics & Epidemiology/Population Health/Interpretation of Medical Literature | 3-5% |
| Human Development | 2-4% |
The clinical science breakdown
The clinical science breakdown tells you which core clerkship a question’s scenario is drawn from, independent of which organ system or content area it touches.
USMLE Step 2 CK content outline: clinical science
| Clinical science | Percentage of exam |
|---|---|
| Medicine | 55-65% |
| Pediatrics | 17-27% |
| Obstetrics & Gynecology | 10-20% |
| Psychiatry | 10-15% |
| Surgery | 5-15% |
The physician task breakdown
The physician task breakdown tells you what kind of clinical decision a question is actually asking you to make, separate from the subject matter or rotation entirely. Step 2 CK’s task list is far more granular than Step 1’s, reflecting its heavier emphasis on patient management.
USMLE Step 2 CK content outline: physician tasks
| Physician task | Percentage of exam |
|---|---|
| Patient Care: Diagnosis | 16-20% |
| Patient Care: Laboratory/Diagnostic Studies | 13-17% |
| Patient Care: Mixed Management | 12-16% |
| Patient Care: Pharmacotherapy | 8-12% |
| Patient Care: Clinical Interventions | 6-10% |
| Patient Care: Health Maintenance/Disease Prevention | 5-10% |
| Patient Care: Prognosis/Outcome | 5-9% |
| Systems-based Practice & Patient Safety | 5-7% |
| Professionalism | 5-7% |
| Practice-based Learning & Improvement | 3-5% |
What this means for how you study
Three things stand out once you see the actual numbers instead of guessing at them.
- Medicine dominates the clinical science axis. At 55 to 65%, internal medicine-style reasoning underlies well over half the exam, regardless of which content area a given question is attached to. If your review time is limited, depth in medicine pays off more than depth in any single other rotation.
- No single content area dominates the way Medicine dominates clinical sciences. The highest content area, Nutrition, tops out at 20%, and the spread across content areas is much flatter than the spread across clinical sciences. Skipping an entire rotation like Surgery or Psychiatry is a riskier bet than skipping depth in a smaller content area.
- Diagnosis and data interpretation outweigh pure management. Patient Care: Diagnosis and Laboratory/Diagnostic Studies together can account for close to a third of the exam, ahead of Mixed Management and Pharmacotherapy combined. Knowing the next diagnostic step matters at least as much as knowing the treatment.
If you want a schedule that reflects this weighting, our Step 2 CK study guide includes a sample four-week dedicated plan, and our Step 2 CK exam dates guide covers registration, scheduling and the 2026 format change.
Frequently asked questions
Is "content outline" the same thing as "syllabus"?
Close enough for practical purposes. USMLE’s own term is the Content Outline and Specifications, published by the NBME and FSMB. Most students just call it the syllabus or the blueprint.
Why do the percentages in different tables not add up to 100% together?
Because content areas, clinical sciences and physician tasks are three separate, overlapping ways of classifying the same set of questions, not three different sets of questions. Each table sums to roughly 100% on its own.
What is the single most heavily tested clinical science on Step 2 CK?
Medicine, at 55 to 65% of the exam, by a wide margin over Pediatrics, Obstetrics & Gynecology, Psychiatry and Surgery.
What is the single most heavily tested content area on Step 2 CK?
Nutrition, at 15 to 20%, though the spread across content areas is much flatter than the spread across clinical sciences, so no single area dominates the way Medicine does.
How is this different from the Step 1 syllabus?
Step 2 CK replaces Step 1’s discipline axis (Pathology, Physiology, Pharmacology, and so on) with a clinical science axis organized by rotation (Medicine, Pediatrics, OB/GYN, Psychiatry, Surgery), and its physician task list is far more granular, split across ten specific patient-care categories instead of Step 1’s four. See our Step 1 syllabus guide for that breakdown.
What about the Step 3 syllabus?
See our Step 3 syllabus guide for the same breakdown applied to Step 3, which drops the clinical science axis entirely and shifts heavily toward diagnosis and management instead of foundational science.
Does the content outline ever change?
The NBME and FSMB can update it, so treat the figures here as a snapshot and confirm the current outline directly on USMLE.org before building a study plan around exact percentages.
Sources and disclaimers
Percentage ranges are taken directly from the USMLE Step 2 CK Content Outline and Specifications, published by the NBME and FSMB at usmle.org, checked on October 1, 2026. These figures are set by the USMLE program and can change, so confirm the current outline directly on USMLE.org before relying on it for exam preparation. MedPrep Institute is not affiliated with or endorsed by NBME, FSMB or USMLE. All trademarks belong to their owners.