USMLE Step 1

Step 1 Practice Questions From Your Own Notes

Upload your lecture slides or notes. QuizMed generates mechanism-focused MCQs in the real Step 1 format — 5-option SBA, clinical vignettes, NBME lab ranges, and US drug names.

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What Is USMLE Step 1?

Basic Sciences

Tests your understanding of foundational science mechanisms — pathology, physiology, pharmacology, biochemistry, and microbiology.

280 Questions, 7 Blocks

Up to 280 single best answer questions across 7 blocks of 40. Pass/fail scoring since January 2022.

Clinical Vignettes

Questions present patient scenarios, then ask about the underlying mechanism, enzyme deficiency, or pathogenesis — not management.

Sample Step 1 Question

Pharmacology / Cardiovascular

A 62-year-old woman is started on a new medication for atrial fibrillation. Two weeks later, she presents with a bluish-gray skin discoloration, and thyroid function tests show elevated TSH. Which of the following best describes the mechanism of action of the drug most likely responsible?

(A)Blocks potassium channels to prolong the action potential duration
(B)Blocks sodium channels to decrease the rate of phase 0 depolarization
(C)Blocks L-type calcium channels to decrease conduction through the AV node
(D)Stimulates muscarinic receptors to increase vagal tone
(E)Inhibits the funny sodium current to decrease automaticity
Explanation: Amiodarone is a class III antiarrhythmic that blocks potassium channels to prolong the action potential duration. Side effects include thyroid dysfunction (both hypo- and hyperthyroidism) and bluish-gray skin discoloration. Step 1 asks for the mechanism, not the drug name.

How QuizMed Matches the Step 1 Format

Mechanism-Focused Lead-Ins

Questions ask "most likely mechanism" and "enzyme deficiency" — not management or next steps.

5-Option Single Best Answer

Standard 5-option SBA format (A–E), with up to 11 options for biostatistics and anatomy items.

NBME Lab Reference Ranges

Lab values use official NBME reference ranges in US conventional units. Abnormal values are not flagged — you identify them.

Correct Discipline Weighting

Pathology 45–55%, physiology 30–40%, pharmacology 10–20% — matching the real exam content outline.

Clinical Vignette Structure

Every question has the 3-identifier stem: Who (age, sex), When (time course), What (defining feature).

US Clinical Context

US generic drug names, US healthcare settings, HIPAA-based ethics scenarios, and US spelling conventions.

Three Steps to Step 1 Practice

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