Shelf exams—officially known as NBME shelf exams—are standardized assessments that medical students take during clinical rotations. Unlike Step exams that measure overall medical knowledge, shelf exams evaluate your competency in specific clinical domains. Each rotation in internal medicine, surgery, pediatrics, psychiatry, family medicine, and obstetrics & gynecology requires a shelf exam.
These exams matter because they serve multiple purposes: they provide feedback on your clinical knowledge, contribute to your final clerkship grade, and create a record of your performance during a critical phase of medical training. But here's what many students don't realize—understanding how shelf exam percentiles work gives you crucial context about where you actually stand compared to your peers.
What Are NBME Shelf Exam Percentiles?
Your percentile on a shelf exam tells you what percentage of test-takers scored the same as or lower than you did. A score at the 50th percentile means that half of the students performed better and half performed worse. The 75th percentile is solid performance. Anything above the 90th percentile is exceptional.
The percentiles you receive are based on NBME's annual data. Medical schools use rolling three-year averages to determine which scores fall into which percentile ranges. This ensures that benchmarks remain consistent while accounting for year-to-year variations in student performance.
What's important to know: the same raw score can correspond to different percentiles depending on which period of the year you're taking the exam and which clerkship it is. That's because performance data varies across the academic year, and schools adjust their percentile tables accordingly.
Why Shelf Exam Percentiles Matter for Your Career
Your clinical rotation performance matters for residency applications. Program directors review your shelf exam scores as part of your clinical performance portfolio. A pattern of strong percentiles across rotations demonstrates consistent clinical competency. Conversely, a weak shelf exam score in a specialty you're interested in pursuing could raise questions during interviews.
The percentile also tells you whether you're meeting the minimum standard or exceeding it. Some schools set their passing threshold at the 10th percentile—meaning you only need to outperform the bottom 10 percent of test-takers to pass. That's a meaningful distinction from scoring at the 50th percentile, which suggests competent baseline performance.
Shelf Exam Percentiles by Specialty
Below are the current percentile conversion tables for each major shelf exam, based on data from the 2026-2027 academic year at Texas Tech University Health Sciences Center. These tables illustrate how raw scores (equated percent correct) are converted to percentiles.
Internal Medicine Shelf Exam Percentiles
Internal medicine is one of the most commonly used specialties for residency consideration. Here's how scores break down:
| Score | Clerkship 1–3 | Clerkship 4–6 |
|---|---|---|
| 90+ | 99th+ | 98th+ |
| 85–89 | 93–98th | 90–97th |
| 80–84 | 80–92nd | 74–88th |
| 75–79 | 59–76th | 51–69th |
| 70–74 | 37–55th | 30–47th |
| 65–69 | 19–34th | 14–27th |
| 60–64 | 9–17th | 6–12th |
| Below 60 | Below 8th | Below 5th |
The minimum passing score is 61 in the early period and 63 in the later period. Scoring in the 70th percentile puts you in solid territory. Anything in the 80s suggests strong clinical knowledge for internal medicine.
Surgery Shelf Exam Percentiles
Surgery percentiles follow a similar pattern but with some notable differences in the passing cutoff and score distribution:
| Score | Clerkship 1–3 | Clerkship 4–6 |
|---|---|---|
| 90+ | 99th+ | 99th+ |
| 85–89 | 95–99th | 93–98th |
| 80–84 | 83–93rd | 76–90th |
| 75–79 | 62–80th | 51–71st |
| 70–74 | 40–58th | 28–47th |
| 65–69 | 20–35th | 13–24th |
| 60–64 | 8–17th | 5–11th |
| Below 60 | Below 8th | Below 5th |
Surgery's minimum passing score is 61 early and 64 later. The percentile distributions are fairly tight, indicating a narrower range of performance among students relative to one another.
Pediatric Shelf Exam Percentiles
Pediatrics has a higher absolute minimum passing score (66 early, 68 later), reflecting the importance schools place on pediatric competency:
| Score | Clerkship 1–3 | Clerkship 4–6 |
|---|---|---|
| 90+ | 97th+ | 96th+ |
| 85–89 | 86–96th | 80–94th |
| 80–84 | 65–82nd | 57–76th |
| 75–79 | 40–60th | 32–52nd |
| 70–74 | 21–36th | 15–28th |
| 65–69 | 9–18th | 6–13th |
| Below 65 | Below 9th | Below 6th |
Notice that pediatric shelf exam percentiles compress more tightly at the lower end. A score in the 75th percentile is genuinely solid here.
Obstetrics & Gynecology Shelf Exam Percentiles
Ob/Gyn has the second-highest minimum passing score (68 early, 70 later), signaling that schools expect strong performance in this specialty:
| Score | Clerkship 1–3 | Clerkship 4–6 |
|---|---|---|
| 90+ | 96th+ | 95th+ |
| 85–89 | 82–95th | 78–93rd |
| 80–84 | 57–78th | 50–73rd |
| 75–79 | 33–51st | 26–45th |
| 70–74 | 15–28th | 11–22nd |
| 65–69 | 6–13th | 4–9th |
| Below 65 | Below 4th | Below 6th |
Ob/Gyn shows similar compression patterns to pediatrics. Scoring above 80 puts you solidly above average.
Family Medicine Shelf Exam Percentiles (Core Exam)
Family medicine offers two score options: a Core exam and a Core + Chronic Care + Musculoskeletal exam. The higher score counts. Here's the Core exam breakdown:
| Score | Clerkship 1–3 | Clerkship 4–6 |
|---|---|---|
| 90+ | 100th+ | 99th+ |
| 85–89 | 96–99th | 91–98th |
| 80–84 | 84–94th | 73–88th |
| 75–79 | 62–80th | 47–69th |
| 70–74 | 38–56th | 24–41st |
| 65–69 | 18–32nd | 10–20th |
| 60–64 | 6–14th | 3–8th |
| Below 60 | Below 6th | Below 4th |
The minimum passing score is 63 early and 65 later. Some students perform better on the combined exam.
Psychiatry Shelf Exam Percentiles
Psychiatry has the highest minimum passing score of all shelf exams (77 early, 77 later). This reflects the particular emphasis medical schools place on psychiatric knowledge:
| Score | Clerkship 1–3 | Clerkship 4–6 |
|---|---|---|
| 90+ | 84th+ | 80th+ |
| 85–89 | 52–79th | 46–74th |
| 80–84 | 23–46th | 19–40th |
| 75–79 | 7–18th | 6–15th |
| Below 75 | Below 6th | Below 7th |
Notice psychiatry's distribution is dramatically different. The percentiles spread out much more gradually. A score of 80 only places you in the 23rd to 46th percentile, depending on the clerkship period. This means that psychiatry shelf exam performance looks different from that of other specialties—scores naturally cluster higher.
Interpreting Your Percentiles
The tables above show raw scores (equated percent correct) and their corresponding percentiles during different clerkship periods. Schools use data from the first quarter of the academic year for students who rotate early in the year, and data from the third quarter for those rotating later. This prevents timing biases.
Key insight: if you scored a 75 on internal medicine during clerkships 1-3, you're at the 59th percentile. If someone else scored a 75 during clerkships 4-6, they're at the 51st percentile. Same raw score, different percentile—because the student population changes by clerkship period, and their performance varies accordingly.
The Bottom Line
Understanding shelf exam percentiles helps you accurately benchmark your performance. It shows you whether you're passing comfortably, crushing it, or barely scraping by. More importantly, it contextualizes your performance within the national picture of medical students taking the same exams.
When you're evaluating your medical school shelf exams, look at your percentile, not just your raw score. That percentile tells you where you actually stand relative to your peers—and that's what residency programs care about.
And if you’re having trouble knowing how to study for your shelf exams, MedBoardTutors is here to help! Our shelf exam tutors will help you ace your clerkship, not just your exam. With helpful tips, guidance, and mentoring, we’ll help you get the target shelf exam score you’re shooting for. Schedule a free tutoring consultation now to learn how we can best assist you.