Electrolyte Disturbances (Assessment & Diagnosis) — 72yo Man | Nephrology | MCCQE1 Q#13301
MCCQE1 Question #13301
Dimension of Care
Acute Care
Activity
Assessment & Diagnosis
Objective
Electrolyte Disturbances
Section
Medicine / Family Medicine
Subject
Nephrology
Last updated: February 2026
A 72-year-old man is admitted with community-acquired pneumonia and is receiving IV antibiotics. On day 2, he becomes mildly confused but remains hemodynamically stable. He reports drinking large amounts of free water because of dry mouth. Past history includes hypertension and osteoarthritis, treated with hydrochlorothiazide, amlodipine, and acetaminophen. Examination shows no peripheral edema, moist mucous membranes, and no orthostatic symptoms. Laboratory studies reveal hypotonic hyponatremia. Which investigation set is most appropriate to help establish the underlying etiology of this patient’s hyponatremia?
Full answer analysis and choices are available inside the practice session.
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