A 24 hours urine calcium test measures the amount of calcium in a sample taken from all the urine that’s produced in a 24-hour period. The test lasts from the morning of one day to the morning of the next day.

SPECIMEN: 10 mL (5 mL min.) aliquot of 24 hour urine. Collect urine with 25 mL 50% concentrated HCl to maintain pH below 3. Record 24-hour urine volume & patient body weight on test request form and urine vial.
STABILITY: Room: 8 hrs; Refrigerated: 4 hrs; Frozen: 2 weeks
REPORT: Daily
USAGE: In the presence of elevated calcium, the body attempts to excrete the excess calcium leading to hypercalciuria. Idiopathic hypercalciuria can occur in the absence of hypercalcemia.