| Ordering Code | 531 |
|---|---|
| Test Name | Magnesium, Urine |
| Alias | 24 Hr Urine Magnesium Random Urine Magnesium |
| Preferred Specimen | Urine, 24 Hour |
| Preferred Container | 24 Hour Urine Container |
| Other Specimen/Container | Random Urine in Clean Container |
| Optimum Volume | 0.5 mL |
| Collection Instructions | Keep refrigerated during collection Record entire 24 Hr Vol on container & requisition Send a well mixed 50 mL aliquot of specimen. |
| Handling Instructions | Acidify urine with 6N HCL to pH 1. |
| Transport Requirements | Oahu: Refrigerated Airline: Refrigerated |
| Specimen Stability | Refrigerated: 3 Days Frozen: 1 Year |
| Rejection Criteria | Insufficient quantity, Not acidified, pH> 7.5, Specimen older than stability limits, Received ambient |
| Avail. Stat | NO |
| Analytic Time | 1 Day |
| Methodology | Colorimetric, Xylidyl Blue |
Reference range(s)
The reference ranges listed below are valid on this date of June 1, 2025.
| Component | Age | Male Norm | Male Critical Low | Male Critical High | Female Norm | Female Critical High | Female Critical Low | Units | Add'l info |
|---|---|---|---|---|---|---|---|---|---|
| 24-Hr Urine Magnesium | ALL | 60-210 | 60-210 | mg/24hr | |||||
| Volume | ALL | mL | See report. | ||||||
| Urine Magnesium | ALL | mg/dL | See report. |