USMLE Step 1 Format: How Long It Is and What It Covers

USMLE Step 1 takes one day: a single 8-hour testing session. For exams on or after May 14, 2026, that session is split into fourteen 30-minute blocks of no more than 20 questions each, with at least 55 minutes of break time and a 5-minute optional tutorial (USMLE Step 1). Before May 14, 2026 it was seven 60-minute blocks of up to 40 questions. Either way the total stays at about 280 questions (USMLE).

Step 1 has been pass or fail since January 26, 2022 (USMLE scoring). This page walks through the day, the content outline, how the result works, and how students decide when to sit it.

By Dr. Sahith Valluru. For The Boards Professor, founded by Dr. Sean Moazezi, DO. Published and last updated October 28, 2026.

Exam format at a glance

Checked October 28, 2026. Rules change; the linked page is the authority.

Topic	Official rule	Source
Length	One day, one 8-hour testing session. From May 14, 2026: fourteen 30-minute blocks, at least 55 minutes of break time and a 5-minute optional tutorial. Before that date: seven 60-minute blocks, 45 minutes of break and a 15-minute tutorial.	USMLE: Step 1
Questions	From May 14, 2026, no more than 20 per block (about 280 in all, per the 2027 Bulletin). Before that date, up to 40 per block and no more than 280 in total.	USMLE: Step 1
Scoring	Pass or fail only, for exams taken on or after January 26, 2022. Examinees who fail receive feedback by content area.	USMLE: results and scoring
Passing standard	Equivalent to 196 on the three-digit scale; USMLE says examinees typically must answer about 60% of questions correctly to pass.	USMLE: results and scoring
Eligibility	A student or graduate of an LCME-accredited MD program, a COCA-accredited DO program, or an ECFMG-eligible school outside the US, at application and on test day.	USMLE 2026 Bulletin of Information
Fee	$695 for students and graduates of LCME-accredited US schools; international test-center surcharges are extra.	NBME: USMLE fees
Results	Typically within four weeks of the test date; USMLE advises allowing at least eight weeks.	USMLE: results and scoring

The 8-hour day, block by block

The 8 hours include everything: the tutorial, the blocks and your breaks. Under the new format, fourteen 30-minute blocks use 7 hours, which leaves 55 minutes of break time and the 5-minute tutorial (USMLE). Finish a block early and the unused minutes go into your break bank; skip the tutorial and its time does the same.

Shorter blocks change the pacing. Twenty questions in 30 minutes is 90 seconds a question, the same rate as the old 40 in 60, but you reset more often and face more transitions. Two practical consequences:

• Plan your breaks. With 14 blocks you cannot rest after every one. Most students take short breaks every two to four blocks and keep a longer one for lunch.
• Practise in 20-question blocks. Time your question-bank work in sets of 20 at 30 minutes so the rhythm is familiar. USMLE has a separate interactive testing experience for exams on or after May 14, 2026 (USMLE sample questions).

What Step 1 covers

USMLE builds Step 1 on an integrated outline: each question is classified by organ system and by discipline, and many count toward more than one discipline (USMLE content outline).

System	Share of exam
Reproductive and endocrine	12–16%
Respiratory and renal/urinary	11–15%
Behavioral health and nervous system/special senses	10–14%
Blood, lymphoreticular and immune	9–13%
Musculoskeletal, skin and subcutaneous tissue	8–12%
Multisystem processes and disorders	8–12%
Cardiovascular	7–11%
Gastrointestinal	6–10%
Social sciences: communication and interpersonal skills	6–9%
Biostatistics and epidemiology/population health	4–6%
Human development	1–3%

By discipline, pathology runs 45–55% and physiology 30–40%, with pharmacology, microbiology, gross anatomy and embryology each 10–20% (USMLE). Because totals overlap, the practical reading is simple: Step 1 is a pathology and physiology exam asked through organ systems.

Pass or fail: what the result means

For any exam taken on or after January 26, 2022, Step 1 reports only pass or fail (USMLE scoring). The standard is equivalent to 196 on the old three-digit scale, and USMLE says examinees typically must answer about 60% of questions correctly to pass (USMLE). If you fail, the report shows your performance by content area, which is the starting point for a retake plan.

Pass or fail does not make Step 1 easy. In 2025, 93% of first-time takers from US MD schools passed, 89% from US DO schools and 75% from schools outside the US (USMLE performance data). A fail uses one of four attempts at the Step (2026 Bulletin), so it is worth sitting only when your practice scores say you are ready.

When do you take Step 1?

USMLE does not set a year. You are eligible once you are enrolled in, or have graduated from, an accredited MD or DO program, or an eligible school outside the US (2026 Bulletin). In practice your school sets the window. Most US students sit Step 1 at the end of the preclinical curriculum, in a dedicated study period of several weeks; some schools now place it after the first clerkships.

Choose the date from evidence, not the calendar:

• Take a baseline first. An NBME CBSSA form estimates your probability of passing (NBME CBSSA).
• Leave room for results. Scores typically come within four weeks, but USMLE says to allow eight (USMLE results). If clerkships or a deadline depend on a pass, count back from it.
• Keep a reschedule margin. If your last two practice scores are not clearly in passing range a week or two out, moving the date usually costs less than a failed attempt.

For a week-by-week plan see the Step 1 study schedule.

Registration and test day

Students and graduates of US and Canadian MD and DO schools register through NBME; the fee is $695, with a surcharge for international test centers (NBME fees). You sit the exam at a Prometric center. Before test day, run the interactive testing experience that matches your date, because the tutorial on the day has fewer screens than the practice version.

If Step 1 did not go your way, read what to do after failing Step 1 before booking again.

Getting help with Step 1

Our tutors work one-on-one with students on Step 1 question approach: reading each vignette for the clue that decides it, eliminating answers on mechanism, and pacing blocks of 20. Sessions are online by live video (Zoom or Google Meet) and built around your school calendar.