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Calcium (urine)

Category Biochemistry
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 & container required 24 hour urine collection acidified
Sample volume 24 hour urine collection
Turnaround time 2 days