| Ordering Code | 248 |
|---|---|
| Test Name | Calcium, 24 Hr Urine |
| Alias | 24 Hr Urine Calcium 24 Hr Urine Ca++ |
| Preferred Specimen | Urine, 24 Hour |
| Preferred Container | 24 Hour Urine Container |
| Optimum Volume | 0.5 mL |
| Collection Instructions | Keep refrigerated during collection. 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 6N HCl added as a preservative Record entire 24 Hr volume and collection time on container & requisition. |
| Handling Instructions | Send a well-mixed, 50 mL aliquot of specimen. Adjust to pH <2.0 with 6N HCl and mix well prior to aliquoting for testing. |
| Transport Requirements | Oahu: Refrigerated Airline: Refrigerated |
| Specimen Stability | Refrigerated: 4 Days Frozen: 3 Weeks Send frozen if transport time >4 days. |
| Rejection Criteria | Grossly hemolyzed, Insufficient quantity, No preservatives, pH >7.5, Specimen older than stability limits, Received ambient |
| Avail. Stat | NO |
| Analytic Time | 1 Day |
| Methodology | Colorimetric, NM-BAPTA |
Reference range(s)
The reference ranges listed below are valid on this date of May 22, 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 Calcium | ALL | 100-300 | 100-300 | mg/24hr | |||||
| Total Volume | ALL | mL | See report. | ||||||
| Total Time | ALL | minutes | See report. | ||||||
| Calcium, Urine | ALL | mg/dL | See report. |