Which of the following laboratory values would be found in a patient with syndrome of inappropriate secretion of antidiuretic hormone?
a. Fasting blood glucose 156 mg/dL
b. Serum potassium 5.8 mEq/L
c. Serum sodium 115 mEq/L
d. Serum sodium 152 mEq/L
C
SIADH causes a dilutional hyponatremia, and central nervous system symptoms can occur. A low serum sodium (below 135 mEq/L) may accompany the syndrome. Glucose elevation is not a classic sign of SIADH. Hyperkalemia does not accompany the dilutional hyponatremia of SIADH. Serum sodium levels are typically lower in the dilutional hyponatremia that accompanies SIADH.
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