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Anaesthesia
Following surgery a patient develops oliguria. You believe the oliguria is due to hypovolemia, but you seek corroborative data before increasing intravenous fluids. Which of the following values suppos the diagnosis of hypovolemia?
Urine sodium of 28 mEq/L
Urine chloride of 15 mEq/L
Fractional excretion of sodium less than 1
Urine/serum creatinine ratio of 20
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