CPT/HCPCS
82310
Order Code
CALU
Turnaround Time
24 hours
Test Includes
Urine calcium
Specimen Requirements
Specimen Source
Urine
Transport Container
(Specimen Container)
(Specimen Container)
Plastic urine container
Preferred Specimens
Urine
Collection Instructions
(Transport Temperature)
(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
Methodology
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.
