Limited Fluid Intake in Medicine / Internal Medicine — 28yo Man | Nephrology | SMLE Q#16518
SMLE Question #16518
Medicine / Internal Medicine
Nephrology
Objective: OBJ-188
Last updated: February 2026
A 28-year-old man presents after 4 days of intense outdoor training in hot weather with limited fluid intake. He reports lightheadedness on standing, diffuse muscle cramping, and fatigue. Examination shows dry mucous membranes, delayed capillary refill, and low urine output since yesterday. Which of the following laboratory findings is most consistent with reduced renal perfusion from volume depletion?
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