Composition of Urinary Calculi

Composition

Percentage of All Calculi

Common Causes

Calcium oxalate

70

Hypercalciuria

Hyperparathyroidism

Hypocitruria

Renal tubular acidosis

15

Hypercalciuria

Hyperparathyroidism

Hypocitruria

Renal tubular acidosis

Cystine

2

Cystinuria

Magnesium ammonium phosphate (struvite)

3

Urinary tract infection

Uric acid

10

Urine pH < 5.5

Occasionally hyperuricosuria

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