Calcium, 24-Hour Urine with Creatinine
Test code
CPT code(s)*
Clinical significance
Test resources
Details
Includes
CPT code 81050 may be added at an additional charge for volume measurement
Methodology
Spectrophotometry (SP)
Specimen requirements | |
|---|---|
| Patient preparation | None Specified |
| Preferred specimen(s) | 10 mL aliquot of a well-mixed, 24-hour collection |
| Alternative specimen(s) | Select a service area to view this section. |
| Minimum volume | Select a service area to view this section. |
| Collection instructions | Refrigerate during and after collection. Collect urine with 25 mL of 6N HCl to maintain a pH <2. Do not include first morning specimen; collect all subsequent voidings. The last specimen collected should be the first morning specimen voided the following morning at the same time as the previous morning's first voiding. Specify 24-hour total volume and collection duration on specimen container and test requisition. |
| Transport container | Plastic screw-cap container |
| Transport temperature | Room temperature |
| Specimen stability | Select a service area to view this section. |
Reference Range(s)
Unrestricted Calcium Diet
| Male | 55-300 mg/24 h | |
| Female | 35-250 mg/24 h | |
| Male | 55-200 mg/24 h |
| Female | 35-200 mg/24 h |
Calcium/Creatinine Ratio
| Male | 30-210 mg/g creat | |
| Female | 30-275 mg/g creat | |
Creatinine, 24-Hour Urine
| <3 Years | Not established |
| 3-8 Years | 0.10-0.80 g/24 h |
| 9-12 Years | 0.20-1.40 g/24 h |
| 13-17 Years | 0.40-1.90 g/24 h |
| >17 Years | 0.50-2.15 g/24 h |
Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.
*The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.
This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.
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