A patient has polyuria and polydipsia, and the urine osmolality is 100 mOsm/kg H2O. The polyuria and polydipsia are not corrected by intravenous injection of ADH, nor does the exogenous ADH alter urine osmolality
What is the most likely disorder in this patient?
A. SIADH (syndrome of inappropriate ADH secretion)
B. osmotic diuresis
C. central diabetes insipidus
D. nephrogenic diabetes insipidus
E. nephrolithiasis (renal stone)
ANS: D
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