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Test Code UCA Calcium, Urine, 24 Hour

Specimen Type

24-hour urine

Collection Volume

Entire collection

Minimum Collection Volume

Entire collection

Collection Instructions

Instruct the patient to void at 8:00 AM and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period, i.e., 8:00 AM the next morning. Screw the lid on securely. Specimens should be transported promptly to the Clinical Laboratory. Container must be labelled with patient’s full name, room number, date and time collection started, and date end time collection finished.

Rejection Criteria

Improper labeling, improper collection, improper storage, portion of 24 hour urine discarded.

Specimen Storage and Stability

Refrigerate specimen.

Turn Around Time

24 hours

Lab Department

Chemistry

Alias

Ca, Urine; Calcium, Urine; 24 Hr. Calcium, Urine;

EPIC Code

LAB814

Acceptable Collection Container

24 hour urine container

Patient Preparation

In stone evaluation, urinary calcium results are more meaningful if the patient initially is on his/her usual diet for three days prior to urine collection. Drugs affecting mineral metabolism include antacids, phosphates, glucocorticoids, carbonic anhydrase inhibitors, anticonvulsants, and diuretics including thiazides. Thiazides are used therapeutically to lower urine calcium excretion. If the patient is on a stone prevention regime and test is for follow-up, then medications should not be stopped for the test.

Day(s) and Time(s) Performed

Monday through Sunday, 24 hours