Chemical composition of urinary stones,in stone passers at Larkana

Objective: to determine the chemical composition of spontaneously passed urinary stones. study design: descriptive. place and duration: the study was conducted at public and private pathology laboratories of larkana from jan: 2009 to dec: 2010. patients and methods: stones of 278 patients were analyzed chemically,using titrimetric method for estimation of calcium and colorimetric method for uric acid and other anions. results: urinary stones of persons ranging in age from 2 to 72 years were determined,having a male to female ratio 2.8:1,the frequency of compounds in stones was calcium oxalate (33.1%),uric acid (18.3%) and struvite stone (7.9%) while percentage of mixed calcium and urate stones were 18% and 22.7% respectively. conclusion: chemical composition of spontaneously passed urinary stones is not different from stones retrieved through pyelolithotomy or by extra corporeal shock wave lithotripsy (eswl).