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Calcium 24 hr Urine

Order Code U001
Turnaround Time 24 hours
Specimen Requirements
Specimen Source
Transport Container
(Specimen Container)

Plastic urine container (6N HCl)

Preferred Specimens
Collection Instructions
(Transport Temperature)
Transport at Room Temperature
Specimen Stability
Temperature Period
Room temperature 5 days
Refrigerated 35 days
Frozen 6 months
Special Instructions

Refrigerate during and after collection. Collect urine with 25 mL of 6N HCl to maintain a pH

Test Details
Clinical Significance

Urinary calcium reflects dietary intake, rate of calcium absorption by the intestine and bone resorption. Urinary calcium is used primarily to evaluate parathyroid function and the effects of vitamin D. A significant number of patients with primary hyperparathyroidism will have elevated urinary calcium. However, there are other clinical entities that may be associated with increased urine calcium: Sarcoidosis, Paget’s disease of bone, vitamin D intoxication, hyperthyroidism and glucocorticoid excess. Decreased urine calcium is seen with thiazide diuretics, vitamin D deficiency and familial hypocalciuric hypercalcem

Reference Ranges

Calcium, 24Hr Urine 150-300 mg/24hr
Creatinine, 24Hr Urine 800-1800 mg/24hr