A 22-year-old man presents to the clinic due to excessive urination. He goes to the restroom almost every 15 minutes. His physical examination is othe

Subject
Medicine
System
Renal, Urinary Systems & Electrolytes

Joyce

Member
Aug 5, 2020
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Singapore
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A 22-year-old man presents to the clinic due to excessive urination. He goes to the restroom almost every 15 minutes. His physical examination is otherwise normal. Laboratory tests show

Serum Na: 140 mEq/L
Urine output: 4 L/24 hours
Urine is negative for glucose and protein and no pus cells
Urine Na: 18 mEq/L
Urine osmolality: 260 mOsm/kg after 4h fluid deprivation.

What is the most likely diagnosis?


A-Diabetes mellitus
B-Diabetes insipidus
C-Psychogenic polydipsia
D-Urinary tract infection
E-Solute diuresis