Urine Concentration and Dilution · Physiology

Syndrome of inappropriate ADH secretion (SIADH) leads to:

  1. Dilute urine with elevated plasma sodium levels
  2. Concentrated urine and hyponatremia
  3. Polyuria and progressive dehydration
  4. Reduced circulating plasma volume
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Correct answer: Concentrated urine and hyponatremia

Excess ADH causes increased water reabsorption. This results in concentrated urine and dilutional hyponatremia.

Difficulty: Medium Question 12 of 20

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