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Magnesium, Urine
Ordering Recommendation
New York DOH Approval Status
Specimen Required
24-hour urine. Refrigerate during collection. Also acceptable: Random urine.
Adjust pH to 1 by adding 6M HCl (approximately 10 mL HCl/24-hour specimen based on normal adult output of 1000-2000 mL/24 hours. Pediatric specimens will require less than 10 mL to reach the correct pH). Record total volume and collection time interval on transport tube and test request form.
Transfer 4 mL aliquot of urine from a well-mixed 24-hour collection to an ARUP Standard Transport Tube. (Min: 0.5 mL)
Refrigerated.
Specimens containing preservatives other than HCl. Specimen submitted in metal containers.
Ambient: 3 days (if acidified); Refrigerated: 2 weeks; Frozen: 1 year
Methodology
Quantitative Spectrophotometry
Performed
Sun-Sat
Reported
Within 24 hours
Reference Interval
Effective August 15, 2011
12-199 mg/d
Interpretive Data
Per 24h calculations are provided to aid interpretation for collections with a duration of 24 hours and an average daily urine volume. For specimens with notable deviations in collection time or volume, ratios of analytes to a corresponding urine creatinine concentration may assist in result interpretation.
FDA
Note
Hotline History
CPT Codes
83735
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 0020207 | Creatinine, Urine - per volume | 2161-8 |
| 0020208 | Creatinine, Urine - per 24h | 2162-6 |
| 0020211 | Magnesium, Urine - per volume | 19124-7 |
| 0020212 | Magnesium, Urine per 24h | 24447-5 |
| 0097110 | Total Volume | 19153-6 |
| 0097111 | Hours Collected | 30211-7 |
Aliases
- Magnesium/Creatinine, Random, Urine
- Mg
