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

Step 1 is a one-day, roughly 8-hour exam containing up to 280 multiple-choice questions divided into seven 60-minute blocks of up to 40 questions each, plus break time and an optional tutorial. All questions are single-best-answer multiple choice, frequently built around clinical vignettes.

What subjects does USMLE Step 1 cover?

Step 1 integrates anatomy, physiology, biochemistry, pharmacology, pathology, microbiology, immunology, genetics, behavioral sciences, nutrition, molecular and cell biology, and biostatistics and epidemiology, organized across organ systems and general principles. Pathology, pharmacology and physiology carry the heaviest weighting.

How long should I prepare for USMLE Step 1?

Most students use a dedicated study period of 6 to 10 weeks after a longer foundation phase alongside coursework. A question-bank-led approach — doing blocks of questions, reviewing every explanation, and tracking weak systems — combined with regular full-length practice tests is the most effective preparation strategy.

What is the passing standard for Step 1?

Step 1 has a minimum passing standard set by the USMLE program. Although results are reported only as pass or fail, your performance must meet this threshold across the exam. Consistent practice-test performance comfortably above the minimum is the best indicator of readiness.

Do IMGs need to take USMLE Step 1?

Yes. International medical graduates must pass Step 1 (and Step 2 CK) as part of ECFMG certification, which is required to enter US graduate medical education (residency). Step 1 is taken by both US and international students on the same standard.

How many USMLE Step 1 practice questions does MedLumen have?

MedLumen's USMLE Step 1 bank is a comprehensive, regularly updated set of vignette-style questions integrated across the basic sciences and organ systems, with full-length mocks, AI-adaptive selection, detailed explanations and analytics. The live question count is shown on this page.

Is there a free USMLE Step 1 question bank or trial?

Yes. MedLumen offers a 7-day free trial with full access to the USMLE Step 1 question bank, mock tests and AI analytics, with no credit card required to start.

Can I study for USMLE Step 1 on my phone?

Yes. MedLumen's Step 1 question bank is available on iOS and Android, with progress and bookmarks synced in real time so you can do question blocks anywhere and keep your momentum between study sessions.

USMLE Step 1 Question Bank 2026 | Pass/Fail Practice Questions & Mocks

What Is the USMLE Step 1 Exam?

USMLE Step 1 is the first examination in the United States Medical Licensing Examination sequence, jointly sponsored by the NBME and FSMB. It assesses whether you understand and can apply the basic sciences to medicine, with emphasis on principles and mechanisms of health, disease and therapy.

It is a one-day, roughly 8-hour computer-based exam of up to 280 single-best-answer questions, most built around clinical vignettes. Step 1 is required for ECFMG certification and US residency.

⚠ Step 1 is now pass/fail

Since 26 January 2022, Step 1 is reported as pass/fail only — no three-digit score. Residency scoring weight has shifted to Step 2 CK, but you still must pass Step 1 to progress, and a fail stays visible on your transcript. Build a solid Step 1 foundation and carry that momentum into Step 2 CK.

USMLE Step 1 Format: One Day, Seven Blocks

Step 1 is a stamina exam as much as a knowledge exam — pacing across seven blocks is a skill in itself.

The Exam

Multiple Choice (Vignettes)

QuestionsUp to 280

Blocks7 × up to 40

Time / block60 minutes

Total time~8 hours

Single-best-answer items, mostly clinical vignettes testing applied basic-science reasoning.

Result

Pass / Fail

ReportingPass/Fail only

SinceJan 2022

StandardMinimum passing

Break time~45 min total

No numeric score is reported; aim to sit comfortably above the minimum passing standard on practice tests.

✓ Practice full-length, not just question sets

Eight hours is exhausting. Sitting timed, full-length practice exams trains your focus and pacing so exam day stamina never becomes the reason you underperform.

USMLE Step 1 High-Yield Subjects

Step 1 integrates the basic sciences across organ systems. Some disciplines reward preparation more than others.

Highest-Yield Disciplines

Pathology: the backbone of Step 1 — mechanisms of disease across every system.
Pharmacology: drug mechanisms, side effects, interactions and toxicities.
Physiology: cardiovascular, renal, respiratory and endocrine regulation.
Microbiology & Immunology: organisms, virulence, immune mechanisms and immunodeficiencies.
Biochemistry & Genetics: metabolic pathways, inherited disease, molecular biology.
Behavioral Science & Biostatistics: ethics, study design, sensitivity/specificity and predictive values — quick, reliable marks.

💡 Think in systems, not silos

Real Step 1 questions blend pathology, pharmacology and physiology in a single vignette. Practising integrated, vignette-style questions — rather than isolated facts — is what builds the reasoning the exam rewards.

How to Prepare for USMLE Step 1

Most students use a dedicated 6–10 week period after a longer foundation phase. Go question-led and review relentlessly. See our USMLE guides on the MedLumen blog.

Foundation Phase

Build core content alongside coursework

Cover the basic sciences system by system, doing untimed questions as you learn each block. The goal is comprehension and a first pass over high-yield content before dedicated study begins.

Dedicated Week 1–3

Timed blocks + relentless explanation review

Do timed question blocks daily and review every explanation — right and wrong. Let analytics surface weak systems and re-drill them. This is where most score gain happens.

Dedicated Week 4–6

Full-length practice exams

Sit full-length, timed mocks to build stamina and confirm you're above the passing standard. Treat each as a diagnostic and re-target your weak areas.

Final Week

Consolidate, then rest

Review bookmarks and your weakest systems only. No new content in the last few days. Rest before an 8-hour exam — fatigue costs more marks than any single fact.

Why MedLumen for USMLE Step 1?

🤖

AI Adaptive Selection

The AI surfaces the questions that expose your weak systems, so every block targets your biggest score gains.

📊

Performance Analytics

Track accuracy by discipline and organ system and see whether you're sitting above the passing standard.

📱

iOS & Android App

Do question blocks on the iOS app or Android app, synced across devices.

📋

Full-Length Mocks

Eight-hour-style timed mocks that build the stamina the real exam demands.

📖

Vignette Explanations

Every answer is explained with the integrated reasoning across pathology, pharmacology and physiology.

🔄

Unlimited Resets

Reset and re-run the bank as many times as you need on the road to test day.

USMLE Step 1 Curriculum Coverage

The question bank integrates the basic sciences across systems. Explore by area:

Behavioral Science Biochemistry & Nutrition Biostatistics & Epidemiology Genetics Gross Anatomy & Embryology Histology & Cell Biology Immunology Microbiology Molecular Biology Neuroscience Pathology Pharmacology Physiology

USMLE Step 1 Question Bank Pricing

All plans include full access to the Step 1 question bank, mock tests and the AI analytics dashboard. Start free — no credit card required.

Free Trial

7 days full access

Full Step 1 bank
Integrated systems
Mock tests included
AI analytics
iOS & Android app

Start Free Trial

No credit card required

Best Value

3 Month Access

$34.99

full 3-month access

Full Step 1 bank
Unlimited mock tests
AI analytics + insights
iOS & Android app
Unlimited progress resets

Activate Now

Best for dedicated study

1 Year Access

$99.99

full 12-month access

Full Step 1 bank
Unlimited mock tests
AI analytics + insights
iOS & Android app
Covers a full prep year

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Ideal for long-runway prep

Frequently Asked Questions About USMLE Step 1

What is the USMLE Step 1 exam?

The first exam in the USMLE sequence (NBME/FSMB). It tests applied basic sciences across organ systems and is required for ECFMG certification and US residency. It's a one-day, ~8-hour computer exam of up to 280 vignette-style questions.

Is USMLE Step 1 pass/fail?

Yes — since 26 January 2022, Step 1 is reported pass/fail only. Residency scoring weight has moved to Step 2 CK, but you must still pass Step 1, and a fail is visible on your transcript.

How many questions and how long?

Up to 280 questions in seven 60-minute blocks of up to 40, over about 8 hours including break time.

What subjects does Step 1 cover?

Pathology, pharmacology, physiology, microbiology, immunology, biochemistry, genetics, behavioral science, anatomy and biostatistics — integrated across systems. Pathology, pharmacology and physiology weigh heaviest.

How long should I prepare?

Typically a 6–10 week dedicated period after a longer foundation phase, using a question-led method with relentless explanation review and full-length practice tests.

Do IMGs need Step 1?

Yes — passing Step 1 and Step 2 CK is part of ECFMG certification, required to enter US residency. The standard is the same for US and international graduates.

What is the passing standard?

A minimum passing standard set by the USMLE program. Results are reported only as pass/fail; aim to sit comfortably above the minimum on practice exams.

Is there a free Step 1 trial?

Yes — a 7-day free trial with full access to the question bank, mocks and analytics, no card required.

Can I study on my phone?

Yes. The Step 1 bank is on iOS and Android with real-time sync, so you can do blocks anywhere and keep your momentum.

Start Your USMLE Step 1 Preparation Today

High-yield, integrated basic-science practice with full mocks and AI analytics. Free 7-day trial.

Start Free 7-Day Trial → View All Pricing Plans

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📚 Further Reading from MedLumen Blog

→ USMLE Step 1 Study Plan for IMGs: 3, 6 & 12-Month Schedules
→ All MedLumen exam preparation guides →