Medical Licensing exam prep

USMLE Step 1 Practice Test 2026-2027 and Free Sample Questions

2026-2027 exam practice page

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USMLE
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USMLE Step 1

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Question 1 Microbiology

Question 1: Microbiology

A 19-year-old college student presents with fever, severe headache, neck stiffness, and a petechial rash that developed over several hours. Cerebrospinal fluid analysis shows numerous neutrophils, low glucose, and elevated protein. Gram stain reveals gram-negative diplococci. Which organism is the most likely cause?

Question 2 Pharmacology

Question 2: Pharmacology

A 58-year-old man with hypertension is started on a new medication and three weeks later develops a persistent dry cough without wheezing or sputum. His cough resolves after the drug is discontinued. The cough is most likely caused by accumulation of which substance?

Question 3 Pathology

Question 3: Pathology

A 65-year-old man with a long smoking history develops a central lung mass. Biopsy shows keratin pearls and intercellular bridges. He is also found to have an elevated serum calcium level with low parathyroid hormone. Which paraneoplastic mechanism best explains the hypercalcemia?

Question 4 Biochemistry

Question 4: Biochemistry

A 6-month-old infant develops irritability, poor feeding, and an enlarged liver after fruit juice is introduced into the diet. Laboratory studies show hypoglycemia after fructose ingestion. The condition is caused by a deficiency of which enzyme?

Question 5 Physiology

Question 5: Physiology

A healthy person quickly stands up from a lying position. Baroreceptors in the carotid sinus detect a transient drop in blood pressure. Which immediate compensatory response is expected?

Question 6 Anatomy

Question 6: Anatomy

A 55-year-old man undergoes surgery in the posterior triangle of the neck and afterward cannot shrug the shoulder or fully turn the head against resistance. Injury to which cranial nerve best explains these findings?

Question 7 Pathology

Question 7: Pathology

A 45-year-old woman with poorly controlled diabetes presents with proteinuria. A renal biopsy shows nodular accumulations of pink material in the glomerular mesangium. These nodules are characteristic of which finding?

Question 8 Pharmacology

Question 8: Pharmacology

A 70-year-old man with atrial fibrillation and heart failure is taking digoxin. He develops nausea, blurred yellow-tinged vision, and a new arrhythmia. Which electrolyte abnormality most predisposes a patient to digoxin toxicity?

Question 9 Microbiology

Question 9: Microbiology

A 30-year-old man develops watery diarrhea after a hiking trip during which he drank from a freshwater stream. Stool examination reveals motile, pear-shaped trophozoites with two nuclei. Which organism is the most likely cause?

Question 10 Behavioral Science

Question 10: Behavioral Science

A study reports that a new screening test for a disease has high sensitivity but low specificity. For a patient who tests positive on this screening test, which statement is most accurate?

Question 11 Pathology

Question 11: Pathology

A 24-year-old woman presents with a malar rash, joint pain, fatigue, and proteinuria. Laboratory testing shows positive antinuclear antibodies and high-titer anti-double-stranded DNA antibodies. Which antibody is most specific for this diagnosis?

Question 12 Physiology

Question 12: Physiology

A patient hyperventilates due to anxiety. Arterial blood gas analysis shows a high pH, low carbon dioxide, and a slightly low bicarbonate. Which acid-base disorder does this represent?

Question 13 Biochemistry

Question 13: Biochemistry

A 4-year-old child has recurrent infections, a history of bleeding tendencies, and partial albinism. A peripheral blood smear shows giant granules in neutrophils. This disorder is caused by a defect in which cellular process?

Question 14 Pharmacology

Question 14: Pharmacology

A 62-year-old woman is started on a statin for hyperlipidemia. Statins lower cholesterol primarily by inhibiting which enzyme in the cholesterol synthesis pathway?

Question 15 Microbiology

Question 15: Microbiology

A 5-year-old unvaccinated child develops a severe sore throat with a gray, adherent pseudomembrane over the tonsils and pharynx. The toxin responsible for the disease acts by which mechanism?

Question 16 Anatomy

Question 16: Anatomy

A patient sustains a midshaft fracture of the humerus and afterward cannot extend the wrist, resulting in wrist drop. Which nerve was most likely injured?

Question 17 Pathology

Question 17: Pathology

A 68-year-old man has a screening colonoscopy that reveals a polyp. Histology shows dysplastic glandular epithelium without invasion through the basement membrane. Which term best describes this lesion?

Question 18 Physiology

Question 18: Physiology

A patient develops diabetes insipidus after head trauma. The kidneys produce large volumes of dilute urine because of a deficiency or reduced action of which hormone?

Question 19 Pharmacology

Question 19: Pharmacology

A patient with an opioid overdose presents with respiratory depression and pinpoint pupils. Which medication should be administered as an antidote, and what is its mechanism?

Question 20 Behavioral Science

Question 20: Behavioral Science

A 30-year-old patient newly diagnosed with a serious illness insists there has been a laboratory mistake and that the diagnosis cannot be correct, despite clear evidence. According to the Kubler-Ross model, which stage of grief does this represent?

Question 1 of 20
About this practice test

What this 2026-2027 USMLE Step 1 Practice Test covers

This page currently provides a free diagnostic sample. The paid bank is not available during editorial and source review.

50 of 300 paid questions are currently stored. Reopening requires 300 unique questions plus reviewed answers, rationales, analogies, sources, and study links.

Work through up to 50 USMLE-style questions built around diagnosis, management, and the wording patterns students usually miss on the first read.
Use answer-by-answer rationales to learn why the correct option wins and why weaker distractors fail in Medical Licensing exam situations.
Review 3 real-world analogies, topic article cards, and source checks after each question so pharmacology and ethics feel easier to recognize under pressure.
Build timing, confidence, and recall with scenario-based practice that feels closer to the real USMLE Step 1 than a generic flashcard dump.

Prepare for the USMLE Step 1 with realistic USMLE practice questions, timed review, detailed rationales, and real-world analogies that make harder Medical Licensing concepts easier to remember.

This practice test is designed for students and professionals preparing for USMLE Step 1 who want stronger exam-day confidence, better explanation quality, and more useful answer review than a generic test bank.

Focus areas include diagnosis, management, pharmacology, ethics, along with scenario-based judgment, careful review of why distractors are less correct, and real-world analogies that help the key ideas stick.

What you will practice on this page

  • Work through up to 50 USMLE-style questions built around diagnosis, management, and the wording patterns students usually miss on the first read.
  • Use answer-by-answer rationales to learn why the correct option wins and why weaker distractors fail in Medical Licensing exam situations.
  • Review 3 real-world analogies, topic article cards, and source checks after each question so pharmacology and ethics feel easier to recognize under pressure.
  • Build timing, confidence, and recall with scenario-based practice that feels closer to the real USMLE Step 1 than a generic flashcard quiz.

How to use this exam to study smarter

  1. Start with the 20-question free sample to spot whether diagnosis or management is slowing you down before you buy the full exam.
  2. After each block, review every rationale and the 3 real-world analogies, topic article cards, and source checks so the tested pattern behind pharmacology becomes easier to remember.
  3. Retake the full USMLE Step 1 practice test in timed mode and focus on cleaner decision-making, not just memorizing the last answer.

Students often land on this page after searching for terms like USMLE Step 1 practice test, USMLE Step 1 practice questions, USMLE Step 1 free practice test, USMLE Step 1 study guide, USMLE Step 1 diagnosis questions, USMLE Step 1 management review. That is why the free sample gives you 10 questions first and the full version goes deeper into the tested patterns.

Frequently asked questions

Is paid access currently available for this exam?

No. Paid checkout is paused while the bank contains 50 of the required 300 questions and completes editorial, rationale, source, and duplication review.

Can I still use the free sample?

Yes. The free sample remains available so you can practice and evaluate the current question style without purchasing an incomplete bank.

When will paid access reopen?

Paid access will reopen only after the bank contains 300 unique questions and receives explicit quality approval for its answers, rationales, analogies, sources, and study links.

Does PracticeTestVault guarantee a passing score?

No practice resource can guarantee a passing score. Use practice results to identify weak topics and confirm important facts against the current official exam outline and authoritative sources.

Question-linked study articles

Study articles that support USMLE Step 1 prep

These guides come from this exam's question topics. Use them after a missed question to review the concept, answer reasoning, distractors, and sources.

PracticeTestVault review illustration for Diagnosis on USMLE Step 1 Review: Diagnosis

Question topic: Diagnosis

USMLE Step 1 Review: Diagnosis

July 16, 2026 2 min read

Review diagnosis for this USMLE Step 1 question with the key prompt clue, correct-answer reasoning, distractor checks, and sources to verify next.

Read article
PracticeTestVault review illustration for Ethics on USMLE Step 1 Review: Ethics

Question topic: Ethics

USMLE Step 1 Review: Ethics

July 16, 2026 2 min read

Review ethics for this USMLE Step 1 question with the key prompt clue, correct-answer reasoning, distractor checks, and sources to verify next.

Read article
PracticeTestVault review illustration for Study strategy on USMLE Step 1 Review: Study strategy

Question topic: Study strategy

USMLE Step 1 Review: Study strategy

July 16, 2026 2 min read

Review study strategy for this USMLE Step 1 question with the key prompt clue, correct-answer reasoning, distractor checks, and sources to verify next.

Read article
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