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Test Code 704 Calcium, Urine, Timed

Important Note

Preservative required: 10 mL 6N HCl.

Bring urine collection container to laboratory prior to starting the collection for the addition of the necessary preservative.

Additional Codes


PowerChart: Calcium Urine Timed

Epic: LAB814 Calcium, Urine, 24 hours

MA Cerner: Urine Calcium Timed.

Test Method

UCL: Ion-Specific Electrode; Beckman DXC600/DXC880i

MA: Bichromatic Endpoint; Siemens Xpand

Specimen Requirement

0.5 mL urine is required.

Additional Specimen Collection Information

Collect a timed urine specimen, 24 hour preferred. 10 mL of 6N HCl is required as a preservative. Keep specimen chilled during the collection period. Submit entire specimen for analysis. Store the urine specimen refrigerated and transport to the lab within 48 hours.


Testing is performed Monday through Sunday.

Typically assayed within 2 hours after the specimen arrives at the testing site.

Reference Values

Males: 25-300 mg/24 hours

Females: 20-275 mg/24 hours

CPT Code Information

82340 Chemistry: Calcium, urine quantitative, timed specimen

Useful For

Identification of abnormal physiologic states causing excess or suppressed excretion of calcium, such as hyperparathyroidism, vitamin D abnormality, diseases that destroy bone, prostate cancer, and drug treatment, such as thiazide therapy.

LOINC Code Information

18488-7 Calcium [Mass/Volume] In 24 Hour Urine