Pituitary Disorders: Acromegaly and SIADH/DI · NCLEX Exam

Which laboratory test is most useful in the initial evaluation of suspected acromegaly?

  1. Random serum growth hormone level
  2. Insulin-like growth factor 1 (IGF-1) level
  3. Urine osmolality measurement
  4. Serum sodium concentration
Show answer and explanation

Correct answer: Insulin-like growth factor 1 (IGF-1) level

IGF-1 is more reliable than random GH because GH is secreted in pulses; elevated IGF-1 supports acromegaly.

Difficulty: Medium Question 2 of 20

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