Thermoregulation and Body Fluids · USMLE Step 1

A patient with diabetes insipidus has decreased ADH activity. Which change best describes their urine?

  1. High volume, low osmolality
  2. Low volume, high osmolality
  3. Low volume, low osmolality
  4. Normal volume, normal osmolality
Show answer and explanation

Correct answer: High volume, low osmolality

ADH deficiency prevents water reabsorption, producing large volumes of dilute urine. Plasma osmolality increases as a result.

Difficulty: Medium Question 12 of 20

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