Imperial Collage Healthcare

Calcium (urine)

Test Background
Renal stones affect on average between 12-15 % of Caucasians (this figure varies in other population groups). Recurrence rates of up to 50 % within 5 years are not uncommon. Risk factors for recurrent renal calculi include low urine output, impaired renal function, hypophosphataemia and hypomagnesaemia in addition to increased uric acid turnover, hypercalcaemia and hyperoxaluria.

Clinical Indications
Diagnosis and monitoring of urolithiasis Screening for idiopathic hypercalciuria of infants/children Recurrent stone formation Family history of stone formation or high-risk groups

Reference Range
2.5-7.5 mmol/24 h

Sample Required
24 hour urine collection acidified

Sample Volume
24 hour urine collection

Turnaround Time
2 days

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