The urine calcium/creatinine ratio is a test that measures the amount of calcium in your urine compared to the amount of creatinine, a waste product in your blood. This test is used to screen for hypercalciuria, a condition where your body excretes too much calcium in your urine. High levels of calcium in your urine can increase your risk of developing kidney stones.
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10 mL (5 mL min.) aliquot of random urine in 2 mL of 6N HCl to maintain pH below 3. Ship refrigerated or frozen.