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CA24
CALCIUM, 24-HOUR URINE

Test Code CA24 
Test CALCIUM, 24-HOUR URINE 
Methodology Colorimetric 
Description Urinary calcium measurement is used in the differential diagnosis of absorptive hypercalciuria and hypercalciuria caused by hyperparathyroidism, hyperthyroidism, Paget's disease, or "renal leak" type of calciuria as seen in renal tubular acidosis. 
Specimen 10 mL (minimum volume: 1.0 mL) from a 24-hour urine collection in a clean, non-sterile plastic urine container. Add 25 mL of 6N HCL as preservative at start of collection, or keep specimen refrigerated during entire collection. Send specimen refrigerated.

NOTE:
1. 24-HOUR VOLUME IS REQUIRED ON REQUEST FORM FOR PROCESSING.
2. Prior to aliquoting specimen, mix specimen well, measure and record volume.
3. Follow "Urine Collection" instructions. 

Reference Values 50 - 300 mg/24 hours

The reference value is for a 24-hour collection. Specimens collected for other than a 24-hour time period are reported in units of mg/dL, for which reference values are not established. 

Analytic Time 1 Day 
Day(s) Test Set Up Monday through Sunday 
CPT Code(s) 82340  

Special Instructions