Calcium, Urine

Calcium, Urine is a topic covered in the Davis's Lab & Diagnostic Tests.

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To indicate sufficiency of dietary calcium intake and rate of absorption. Urine calcium levels are also used to assess bone resorption, kidney stones, and renal loss of calcium.

Patient Preparation
There are no fluid, activity, or medication restrictions unless by medical direction. Usually, a 24-hr urine collection is ordered. Instruct the patient to follow a normal calcium diet for at least 4 days before test. Protocols may vary among facilities. As appropriate, provide the required urine collection container and specimen collection instructions.

Normal Findings
Method: Spectrophotometry.

AgeConventional Units*SI Units (Conventional Units × 0.025)*
Infant and childUp to 6 mg/kg per 24 hrUp to 0.15 mmol/kg per 24 hr
Adult on average diet100–300 mg/24 hr2.5–7.5 mmol/24 hr
*Values depend on diet.

Critical Findings and Potential Interventions

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