Result: 36 patients (30%) had renal lithiasis, 23 patients (19.1%) had abnormal renal morphology, 56 patients (46.7%) had low urine density; 90 patients (75%) had renal failure. Complication of nephrolithiasis had relations with time of gout, low urine density and renal function measured by creatinine clearance from 24 hour urine collection.