Biochemical evaluation of patients with urolithiasis.

Inhibition of calcium oxalate crystal growth was analyzed in 84 male and 30 female patients with urolithiasis and in 27 normal men and 7 normal women. No significant difference in inhibition index was found between stone formers and normal subjects or between male and female stone formers. The quotient, calcium X oxalate/magnesium X inhibition index, was significantly higher in urine from male stone formers (p less than 0.01) and the same was found for the quotient, calcium X oxalate/magnesium X citrate X inhibition index (p less than 0.005).