USMLE Step 1 Exam 2026: Format, Syllabus, Eligibility, MCQs

USMLE Step 1 Quick Summary

USMLE Step 1 is a one-day, 8-hour computer-based exam of up to 280 multiple-choice questions, now delivered in fourteen 30-minute blocks. It tests how well you understand and apply the basic sciences to clinical scenarios, and since January 2022 it has been reported as pass/fail only.

USMLE Step 1 Exam

Step 1 is the first of the three USMLE Steps and, together with Step 2 CK, a requirement for ECFMG Certification and US residency for international medical graduates (IMGs). Questions are clinical vignettes that ask you to apply anatomy, physiology, pathology, pharmacology, microbiology, and the other foundational sciences — knowing a fact is rarely enough; you need to know why it explains the patient in front of you.

Eligibility criteria for USMLE Step 1

International medical students and graduates can apply for Step 1 if they meet the following:

Recognised medical school: You are officially enrolled in, or have graduated from, a medical school listed in the World Directory of Medical Schools as meeting ECFMG eligibility requirements.
Students can apply too: You don't need to have graduated — enrolled medical students are eligible, which is why many IMGs take Step 1 during medical school.
Attempts remaining: You have fewer than four previous attempts at any USMLE Step, and you have not already passed Step 1.
Register through FSMB: Since January 2026, IMGs apply for Step 1 directly through the FSMB via the USMLE website, rather than through ECFMG.

Doctors from Pakistan can check our USMLE eligibility requirements for Pakistani doctors for country-specific guidance.

How USMLE Step 1 is scored

Pass/fail only
Step 1 has been reported as pass/fail since January 26, 2022 — there is no three-digit score on your transcript. Results are usually released within four weeks, though you should allow up to eight. If you pass, you cannot retake Step 1 to improve your result, and you have a maximum of four attempts at each Step; see our guide to USMLE retake limits.

USMLE Step 1 syllabus and subject weightage

The official USMLE test specifications organise Step 1 by organ system, with the following share of questions:

System
Share of exam
Reproductive & Endocrine Systems
12-16%
Respiratory & Renal/Urinary Systems
11-15%
Behavioral Health & Nervous Systems/Special Senses
10-14%
Blood & Lymphoreticular/Immune Systems
9-13%
Musculoskeletal, Skin & Subcutaneous Tissue
8-12%
Multisystem Processes & Disorders
8-12%
Cardiovascular System
7-11%
Gastrointestinal System
6-10%
Communication & Interpersonal Skills
6-9%
Biostatistics & Epidemiology/Population Health
4-6%
Human Development
1-3%

By discipline, pathology (45-55% of questions) and physiology (30-40%) dominate, followed by nutrition (15-20%), gross anatomy & embryology, microbiology, and pharmacology (10-20% each), then behavioral sciences, biochemistry, histology & cell biology, immunology, and genetics. These ranges overlap because a single question can test several disciplines at once — for example, the pathology and pharmacology of the same disease.

USMLE Step 1 practice questions
Our Step 1 Qbank has 3000+ high-yield, exam-style questions with explanations, organised by system and discipline so you can target your weak areas.

USMLE Step 1 exam format

280
Max MCQs
8 hours
One-day exam
14 × 30 min
Question blocks
Pass/Fail
Score reporting

Step 1 is a closed-book, computer-based exam taken at Prometric test centers. From May 14, 2026, it is delivered in fourteen 30-minute blocks of up to 20 questions each (previously seven 60-minute blocks), with 55 minutes of break time for the day. Every question is single best answer: a patient vignette followed by four or more options, sometimes with images or audio findings. Unanswered questions count as wrong, so always mark an answer before a block ends. The USMLE website offers more than 100 free sample questions and a tutorial of the new test software.

How to apply for USMLE Step 1

  1. Confirm your medical school is listed in the World Directory of Medical Schools as meeting ECFMG eligibility requirements.
  2. Create your account and submit your Step 1 application through the FSMB via the USMLE website.
  3. Choose the eligibility period during which you want to test, and pay the exam fee.
  4. Once your application is approved, use your scheduling permit to book a date at a Prometric test center.
  5. Sit the exam and receive your pass/fail result, usually within four weeks.
  6. Continue to Step 2 CK, which together with Step 1 counts toward ECFMG Certification.

Not sure when to sit Step 1? See our USMLE exam timeline for the ideal time to start each Step.

Preparation tips for USMLE Step 1

Build on pathology and physiology
Together they appear in most questions, so make them the backbone of your revision and link pharmacology and microbiology to them system by system.
Practise in 30-minute blocks
Time yourself on 20-question sets so the new block length and pacing feel routine long before exam day.
Don't skip the smaller topics
Biostatistics, epidemiology, and communication skills together make up around 10-15% of the exam and are among the easiest marks to secure.
Learn from every explanation
Review why each wrong option is wrong, not just why the right one is right — that is how vignette reasoning improves.

USMLE Step 1 sample practice MCQs

Test your knowledge with these original clinical vignette-style questions, reflecting the format used in the actual exam. Tap a question to reveal the answer.

> Question 1: Pharmacology

A 56-year-old man with atrial fibrillation has been stable on warfarin for a year. He is started on a 6-month course of rifampin for latent tuberculosis. Two weeks later, his INR has fallen well below the target range. Which of the following best explains this change?

A) Reduced intestinal absorption of warfarin
B) Induction of hepatic cytochrome P450 enzymes
C) Displacement of warfarin from plasma proteins
D) Increased synthesis of vitamin K by gut bacteria

Correct answer: B) Induction of hepatic cytochrome P450 enzymes

Rifampin is a potent inducer of hepatic cytochrome P450 enzymes, including CYP2C9, which metabolises warfarin. Faster warfarin clearance lowers its anticoagulant effect and the INR. Protein-binding displacement would raise free warfarin and increase the INR, the opposite of what happened.

> Question 2: Microbiology

A 19-year-old college student develops fever, neck stiffness, and a spreading petechial rash, and becomes hypotensive within hours. Cerebrospinal fluid shows gram-negative diplococci. Which bacterial component is most responsible for her hypotension and disseminated intravascular coagulation?

A) Polysaccharide capsule
B) IgA protease
C) Lipooligosaccharide (endotoxin)
D) Pili

Correct answer: C) Lipooligosaccharide (endotoxin)

This is meningococcal disease caused by Neisseria meningitidis. Its lipooligosaccharide endotoxin triggers massive cytokine release, causing septic shock and DIC. The capsule helps the organism evade phagocytosis and pili mediate attachment, but neither directly causes the shock.

> Question 3: Physiology

A 24-year-old woman with type 1 diabetes presents with vomiting and rapid, deep breathing. Labs: Na+ 135 mEq/L, Cl- 98 mEq/L, HCO3- 12 mEq/L; arterial pH 7.20, PaCO2 26 mm Hg. Which of the following best describes her acid-base status?

A) High anion gap metabolic acidosis with appropriate respiratory compensation
B) Normal anion gap metabolic acidosis
C) High anion gap metabolic acidosis with a concurrent respiratory acidosis
D) Primary respiratory alkalosis

Correct answer: A) High anion gap metabolic acidosis with appropriate respiratory compensation

The anion gap is 135 − (98 + 12) = 25, which is high, consistent with diabetic ketoacidosis. Winter's formula predicts a PaCO2 of 1.5 × 12 + 8 = 26 ± 2 mm Hg; her measured PaCO2 of 26 shows the respiratory compensation is appropriate, so there is no second primary disorder.

Frequently asked questions

> Is USMLE Step 1 pass/fail?

Yes. Since January 26, 2022, Step 1 results are reported only as pass or fail, with no three-digit score on your transcript.

> How many questions are on USMLE Step 1, and how long is it?

Up to 280 multiple-choice questions in one 8-hour day. From May 14, 2026, they are split into fourteen 30-minute blocks of up to 20 questions each, with 55 minutes of break time.

> Which subjects carry the most weight on Step 1?

Pathology (45-55% of questions) and physiology (30-40%) appear in the most questions. By organ system, reproductive & endocrine (12-16%) and respiratory & renal (11-15%) are the largest sections.

> Can I retake Step 1 after passing it?

No. A passed Step cannot be retaken, except to meet a time limit set by a US medical licensing authority. If you don't pass, you have a maximum of four attempts per Step — see our USMLE retake limits guide.

> How should I prepare for USMLE Step 1?

Combine a structured, system-by-system review with timed practice on exam-style questions. Our Step 1 Qbank and Live Online USMLE course are built around the current exam format. Once you pass, our Step 2 CK Qbank covers the next Step.

Ready to pass USMLE Step 1 on your first attempt?

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