Body-mass index and chemical composition of urinary stones

The mineral composition of the 437 urinary stones was studied in 437 patients with urolithiasis aged from 16 to 75 years, which have been treated in the National Scientific Urological Institute. Body-mass index (BMI), blood biochemistry panel and biochemistry of 24-hour urine probe were evaluated in all patients. Quartile analysis of the data was done according to the BMI distribution. Lower quartile was represented by BMI values 2 (n=99), upper quartile by BMI values > 33.1 kg/m2 (n=99). The patients with urolithiasis and obesity compared to those without obesity presented with increased excretion rates of uric acid (1.15 times more, p2 carry a high risk of urate stones formation (OR 6.5, p