The final Step — taken as a doctor.

What it measures

Step 3 assesses whether a physician can apply medical knowledge and understanding of biomedical and clinical science in the care of patients — the standard that matters for a general, unsupervised license to practice. Where Step 1 tests foundations and Step 2 CK tests clinical knowledge, Step 3 tests judgment: the decisions of a physician who will soon be practicing without direct supervision.

The two-day format

Step 3 is administered over two days. The first day covers the foundational and clinical knowledge tested by multiple-choice questions; the second day adds computer-based case simulations — interactive patient-management cases in which the examinee orders tests, makes diagnoses, and adjusts treatment over simulated time. The case simulations are the distinctive feature of Step 3: they assess real-time clinical decision-making rather than recall.

Timing and pass rates

Most residents take Step 3 during intern year — early enough that the basic-science knowledge from Step 1 is still fresh, and before the clinical demands of later residency years consume all study time. Some states' licensing boards set their own expectations about when Step 3 must be completed, so residents should check their own state's requirements rather than assuming a single national timeline.

First-time pass rates are the highest of the three Steps: US MD takers passed on the first attempt at about 97% in 2023. That said, residency programs can see the attempt, and the 2024 NRMP program-director survey found that 77% of respondents consider failed Step attempts when deciding whom to interview — a reminder that even this final Step rewards a prepared first attempt.

Passing standards, fees, eligibility rules, and attempt policies change over time — confirm the current rules at usmle.org and nbme.org. Pass-rate figure: USMLE Performance Data (NBME), as summarized in AMA reporting.