USMLE Step 2 CK Practice Questions: A Sample Question Bank Guide

As of the current format (effective May 7, 2026), Step 2 CK is divided into sixteen 30-minute blocks, administered in one 9-hour testing session, with up to 20 questions per block. Minimum break time is 55 minutes, plus an optional 5-minute tutorial — unused block time can roll into break time if you finish a block early. Every question is single-best-answer multiple choice, drawn from a real content blueprint weighted by system/discipline and clinical science category (Medicine alone accounts for 55–65% of the exam by clinical science weighting).

Below are four practice questions in that same single-best-answer format and difficulty range — TopQbank's own original items, not real retired USMLE questions (NBME does not publish a full retired-question bank, only its own small official sample set separately).

Question 1

A 62-year-old man with a 40-pack-year smoking history presents with a 2-month history of progressive dyspnea and a dry cough. Chest X-ray shows a right upper lobe mass. CT-guided biopsy confirms non-small cell lung cancer. Staging workup shows no evidence of distant metastasis, but the mass involves the mediastinum with ipsilateral mediastinal lymph node involvement. What is the most appropriate next step in management?

A) Surgical resection alone

B) Concurrent chemoradiotherapy

C) Palliative care referral only

D) Single-agent chemotherapy

Correct answer: B) Concurrent chemoradiotherapy. Locally advanced NSCLC with mediastinal lymph node involvement (stage III) is generally considered unresectable at presentation, and the standard of care is concurrent chemoradiotherapy, often followed by consolidation immunotherapy. Surgical resection alone is appropriate for earlier-stage, resectable disease; palliative care alone is reserved for cases with no realistic curative or disease-modifying option, which does not apply here given the absence of distant metastasis.

Question 2

A 27-year-old woman presents with a 6-month history of amenorrhea, galactorrhea, and headaches. Serum prolactin is markedly elevated, and MRI reveals a 1.5 cm pituitary mass. What is the most appropriate initial treatment?

A) Transsphenoidal surgery

B) Radiation therapy

C) A dopamine agonist (e.g., cabergoline)

D) Observation with repeat imaging in 1 year

Correct answer: C) A dopamine agonist (e.g., cabergoline). For prolactinomas, dopamine agonist therapy (cabergoline or bromocriptine) is first-line treatment regardless of tumor size, effectively normalizing prolactin levels and often shrinking the tumor itself — unlike most other pituitary adenomas, where surgery is typically first-line. Surgery is reserved for cases resistant or intolerant to medical therapy, or with acute mass effect (e.g., vision loss) requiring urgent decompression.

Question 3

A 55-year-old woman with type 2 diabetes and known peripheral neuropathy presents with a painless plantar ulcer on her right foot that has been present for 3 weeks. There is no surrounding erythema, and pedal pulses are intact. What is the most important next step in management?

A) Immediate below-knee amputation

B) Offloading, wound debridement, and infection assessment

C) Reassurance, as painless ulcers are not concerning

D) Oral antibiotics alone, without further evaluation

Correct answer: B) Offloading, wound debridement, and infection assessment. Diabetic neuropathic foot ulcers require offloading pressure from the affected area, debridement of non-viable tissue, and assessment for underlying infection or osteomyelitis (including probing to bone and imaging if indicated) — the painless nature reflects the underlying neuropathy, not lower severity. Amputation is a last resort, not an initial step, and antibiotics alone without addressing pressure offloading and debridement are insufficient for healing.

Question 4

A 19-year-old man presents to the emergency department after a motor vehicle collision with left-sided chest pain and shortness of breath. On examination, breath sounds are absent on the left, the trachea is deviated to the right, and he is hypotensive with distended neck veins. What is the most appropriate immediate management?

A) Chest X-ray before any intervention

B) Immediate needle decompression of the left chest

C) CT chest with contrast

D) Observation and repeat vital signs in 30 minutes

Correct answer: B) Immediate needle decompression of the left chest. This presentation — absent breath sounds, tracheal deviation away from the affected side, hypotension, and distended neck veins — is classic for tension pneumothorax, a clinical diagnosis and immediately life-threatening emergency. Treatment is immediate needle decompression, not imaging first: waiting for a chest X-ray or CT delays a time-critical intervention and risks cardiovascular collapse.