Useful For: Calcium, 24-Hour Urine without Creatinine – 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.
Methodology: Colorimetry
Specimen Requirements:
Submit an entire 24-hour urine collection in a urine container supplied by Meadville Medical Center Laboratory. No preservative necessary. Refrigerate specimen during and after collection.
Refer to “Patient Information” section in back of manual for patient handout explaining collection information for this test.
Analytical Time:
1 day
Days Set Up: Monday through Friday
CPT Information:
82340 –