INTRODUCTION Nephrolithiasis is a common disorder with a reported incidence of 12% in industrialized countries. The peak incidence is in ages 20s to 40s. Men are affected two to three times more often than women. Gouty diathesis describes uric acid or calcium oxalate nephrolithiasis and low urinary pH (<5.5) in the absence of excessive gastrointestinal alkali loses or dietary animal protein excess. Hyperuricemia, hypertriglyceridemia, and a history of gouty arthritis may be present. Subjects with gout are singularly predisposed to stone formation. Persistent acidity of the urine is a common manifestation of primary gout, that may be accompanied by uric acid nephrolithiasis. In the presence of an increase in the concentration of uric acid in the urine, the formation of uric acid stones is further facilitated.