What is the most appropriate isotonic fluid for a dehydrated adult male with normal renal function (creatinine 0.87 mg/dL, estimated glomerular filtration rate >90 mL/min), normal sodium (140 mmol/L), upper‑normal potassium (5 mmol/L), elevated blood urea nitrogen/creatinine ratio (~27) and no oral intake?

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Last updated: February 13, 2026 • View editorial policy

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