USMLE Step 1 Sample Test Questions Study Notes

Example Item:

• Scenario: A 32-year-old woman with type 1 diabetes presents with renal failure, with lab results showing.

• Options:

  • (A) Acute blood loss

  • (B) Chronic lymphocytic leukemia

  • (C) Erythrocyte enzyme deficiency

  • (D) Erythropoietin deficiency (Answer: D)

Laboratory Values Reference Ranges

Serum General Chemistry Values:

• Electrolytes:

  • Sodium (Na+): 136–146 mEq/L

  • Potassium (K+): 3.5–5.0 mEq/L

  • Chloride (Cl–): 95–105 mEq/L

  • Bicarbonate (HCO3–): 22–28 mEq/L

  • Glucose (Fasting): 70–100 mg/dL

  • Creatinine: 0.6–1.2 mg/dL

Hepatic Enzyme Reference Results:

• Alkaline phosphatase: 25–100 U/L

• Alanine aminotransferase (ALT): 10–40 U/L

• Aspartate aminotransferase (AST): 12–38 U/L

Complete Blood Count Guidelines:

• Hematocrit:

  • Males: 41%–53%

  • Females: 36%–46%

• Hemoglobin, blood:

  • Males: 13.5–17.5 g/dL

  • Females: 12.0–16.0 g/dL

Sample Test Block Example

Block 1 (Questions 1–40):

1. Case: 67-year-old woman with congenital bicuspid aortic valve.

   • Diagnosis: Endocarditis

   • Mechanism of Action Exploration: Question: In addition to penicillin, what other antibiotic is synergistic?

   • Options:

     • (A) Binding to DNA-dependent RNA polymerase

     • (B) Binding to the 30S ribosomal protein …

Notes on Time Management:

• The exam is timed; administer one hour to complete each block of 40 items.

• For blocks with fewer items (e.g., 39 items), reduce the time slightly.

Answer Form Completion and Key Insights

• Answer Key Tabulations:

• Block 1:

  • 1: B

  • 2: A

  • 3: C

  • 4: C

  • 5: A

  • (Continue for all questions)

Note: This guide serves as a complete reference for understanding the USMLE Step 1 test format, addressing strategies for question formats, providing essential lab values, and delivering a comprehensive review of example questions. Students should ensure consistent practice from the official USMLE question bank in addition to reviewing these notes.