Musculoskeletal and Skin: Osteoporosis, Psoriasis · USMLE Step 1

A patient presents with vertebral compression fractures. Which lab abnormality is expected in primary osteoporosis?

  1. Elevated parathyroid hormone
  2. Elevated alkaline phosphatase
  3. Elevated serum calcium
  4. Normal calcium, phosphate, and PTH
Show answer and explanation

Correct answer: Normal calcium, phosphate, and PTH

Primary osteoporosis does not alter calcium, phosphate, or PTH levels. Diagnosis relies on bone density and fracture risk.

Difficulty: Medium Question 9 of 20

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