Calcium, Urine
Test Code: 003269
Performing Lab: LabCorp
CPT Code: 82340 001
Synonym
Ca, Urine
Specimen Type
Urine (24-hour)
Specimen Container
Plastic urine container with at least 10 mL 6N HCl (hydrocloric acid).
Volume
25 mL aliquot
Minimum Volume
1.0 mL(NOTE: This volume does NOT allow for repeat testing.)
Specimen Handling
Instruct the patient to void at 8 AM and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM the next morning). Screw the lid on securely. Transport the specimen promptly to the laboratory. Container MUST be labeled with patient's full name, room number, date and time collection started, and date and time collection finished. pH must be <2.
Patient Prep
Urinary calcium results are more meaningful if the patient has been on a low calcium, neutral ash diet for three days prior to urine collection. Drugs affecting mineral metabolism should be withdrawn, if possible, two to four weeks prior to and during collection. These include antacids, phosphates, diuretics, glucocorticoids, carbonic anhydrase inhibitors, and anticonvulsants.
Unacceptable Conditions
Improperly labeled specimen, fetal urine sample received
Temperature
Maintain specimen at room temperature.
Methodology
Colorimetric
Stability
Room Temperature: 14 days
Refrigerated: 14 days
Frozen: 14 days
Refrigerated: 14 days
Frozen: 14 days
| Result Code | Result Name | LOINC |
|---|---|---|
| 013490 | Calcium, Urine | 18488-7 |
| 013243 | Calcium, Urine 24hr | 6874-2 |
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