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Test Code UCA24H Calcium, Urine, 24 hour, LAB814

Performing Laboratory

St. Luke's Hospital Cedar Rapids

Specimen Requirements


Preferred: 24-hour urine collection

Specimen Volume: 0.1 mL from a 24-hour timed urine collection. Refrigerate specimen during

                               collection, and send specimen refrigerated.

Stability: Urine specimens may be stored up to 4 days at 2-8°C.

Collection Instructions: Obtain 24-hour urine jug from laboratory

Note: 1. When preparing jug for collection add 20-30 mL of 6N HCL per 24-hour specimen.

               Alternatively, specimen may be just refrigerated during collection, and acidified to a 

               pH of 2 upon receipt in laboratory. (FOR LAB USE ONLY)

          2. Starting and ending times of collection are required.

          3. When a 24-hour urine for Calcium is done, a PV (period and volume) must also be

              ordered and resulted. (FOR LAB USE ONLY)

Reference Values

42-353 mg/24 hours

Day(s) Test Set Up

Monday through Sunday

Useful For

Calcium measurements are used in the diagnosis and treatment of parathyroid disease, a variety of bone diseases, chronic renal disease, and tetany (intermittent muscular contractions or spasms). 


Cresolphthalein Complexone

Test Classification and CPT Coding

81050-Urine timed measurement


Analytic Time

Within 1 hour of receipt