CALCIUM, 24 HOUR URINE
20 mL of 24 hour urine in sterile screw-cap container.
Indicate 24hr volume on container and lab order.
Refrigerated 7 days
Urinary calcium excretion is increased in hyperparathyroidism, vitamin D intoxication, diseases that destroy bone (multiple myeloma, metastasis from prostate cancer) and following calcium supplementation. Thiazide drugs may reduce calcium excretion