We studied retrospectively 38 children who presented with urolithiasis between 1970 and 1977. The sex ratio was 1:1 and the mean age was 9.4 years. A positive family history was found in 36 per cent. Urinary tract abnormalities predisposing to infective urolithiasis was found in 7 children (18 per cent) but required voiding cystography for detection in 5. Hypercalcemia was found in 3 of 32 (8 per cent), while 28 of the 38 patients (74 per cent) had idiopathic urolithiasis. Idiopathic hypercalciuria was found in 5 of 13 patients (38 per cent) with idiopathic urolithiasis. Investigation of urolithiasis in children should include voiding cystography and measurement of urine calcium, as well as oxalate and uric acid, under home diet conditions.
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