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Calcium, 24 Hr Urine with Creatinine : 1635
Test CodeU24CAU or 1635
CPT Codes
82340, 82570
Instructions
Refrigerate during and after collection. Collect urine with 25 mL of 6N HCl to maintain a pH <3. Do not include first morning specimen; collect all subsequent voidings. The last specimen collected should be the first morning specimen voided the following morning at the same time as the previous morning’s first voiding.
Specify 24-hour total volume and collection duration on specimen container and test requisition.
Specify 24-hour total volume and collection duration on specimen container and test requisition.
Transport Container
Preferred Specimen
10 mL aliquot of a well-mixed, 24-hour collection
Alternative Specimens
Unpreserved urine or Urinalysis transport tube (yellow-top, blue fill line, preservative tube)
10 mL aliquot of a well-mixed, 24-hour collection
Alternative Specimens
Unpreserved urine or Urinalysis transport tube (yellow-top, blue fill line, preservative tube)
Transport Temperature
Room temperature.
Specimen Stability
Room temperature: 7 days; Refrigerated: 7 days; Frozen: 28 days
Methodology
Spectrophotometry
Setup Schedule
Sunday - Saturday
Report Available
1 day
Reference Range
Not established
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.
Performing Laboratory
med fusion
