|Test||CALCIUM, 24-HOUR URINE|
|Description||Urinary calcium measurement is used in the differential diagnosis of absorptive hypercalciuria and hypercalciuria caused by hyperparathyroidism, hyperthyroidism, Paget's disease, or "renal leak" type of calciuria as seen in renal tubular acidosis.|
|Specimen||10 mL (minimum volume: 1.0 mL) from a 24-hour urine collection in a clean, non-sterile plastic urine container. Add 25 mL of 6N HCL as preservative at start of collection, or keep specimen refrigerated during entire collection. Send specimen refrigerated.
|Reference Values||50 - 300 mg/24 hours
The reference value is for a 24-hour collection. Specimens collected for other than a 24-hour time period are reported in units of mg/dL, for which reference values are not established.
|Analytic Time||1 Day|
|Day(s) Test Set Up||Monday through Sunday|