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[Evaluation of risk index according to Tiselius in patients with calcium urinary stones].

Daily calcium, oxalates, magnesium, citrates and creatinine excretion with the urine was determined in 36 patients with calcium renal stones and in 25 healthy individuals. Then, risk index according to Tiselius was calculated. It was found that daily calcium excretion is significantly higher and daily citrates excretion is significantly lower in patients with calcium renal stones. Daily excretion of oxalates, magnesium and creatinine with the urine did not differ in both groups. Risk index according to Tiselius was two-fold higher in patients suffering from urolithiasis than in healthy individuals (p greater than 0.001) and better illustrated the tendency to stone formation than the analysis of metabolic disorders.