Magnesium, 24-Hour Urine with Creatinine
Test code
CPT code(s)*
Test resources
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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 urine collected in 24-hour urine container |
| Alternative specimen(s) | 10 mL concentrated Glacial acetic acid • 10 g boric acid Acceptable to add preservative after collection |
| Minimum volume | 1 mL |
| Collection instructions | Collect urine with 25 mL of 6N HCl to maintain a pH <3. Do not include first morning specimen; collect all subsequent voidings. The last sample collected should be the first morning specimen voided the following morning at the same time as the previous morning's first voiding. Record 24-hour urine volume on test requisition and urine vial. |
| Transport container | Sterile screw-cap vial |
| Transport temperature | Room temperature |
| Specimen stability | Room temperature: 4 days Refrigerated: 7 days Frozen: 90 days |
Reference Range(s)
Magnesium, 24-Hour Urine
| Male | 28-180 mg/24 h |
| Female | 18-130 mg/24 h |
Magnesium, 24-Hour Urine
| Male | 16-90 mg/g creat |
| Female | 30-135 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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