Hypouricemia due to Increased Tubular Urate Secretion

Abstract
A 45-year-old woman had hypouricemia (serum uric acid, 1.0–2.3 mg/dl) with increased uric acid clearance (29.8 ± 9.3 ml/min/1.73 m2). Uric acid clearance to creatinine clearance ratio (Cua/Ccr) was suppressed markedly by pyrazinamide to 2.3% and surprisingly enhanced by probenecid to 227.8%. No other renal tubular or metabolic abnormalities were detected. This previously unreported high postprobenecid Cua/Ccr suggests that markedly increased urate secretion by the renal tubule is responsible for hypouricemia in this patient.

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