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Calcium Urine

Order Code CALU
Turnaround Time 24 hours
Test Includes

Urine calcium

Specimen Requirements
Specimen Source
Transport Container
(Specimen Container)

Plastic urine container

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

Adjust pH to <3 with 6N HCl

Test Details
Spectrophotometry (SP)
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 hypercalcemia.