| Ordering Code | 4686 |
|---|---|
| Test Name | Homocysteine, Total |
| Preferred Specimen | Serum |
| Preferred Container | SST (Gold) |
| Other Specimen/Container | Plasma in EDTA, K2 (Lavender), Plasma in Lithium Heparin (Green), Serum in Plain (Red) |
| Optimum Volume | 0.5 mL |
| Handling Instructions | Centrifuge to separate RBCs from serum/plasma within 1 hour of collection, aliquot serum/plasma whenever no physical gel separator layer is present. |
| Transport Requirements | Oahu: Ambient Airline: Refrigerated |
| Specimen Stability | Ambient: 4 Days Refrigerated: 4 Weeks Frozen: 10 Months Stability applies ONLY to serum/plasma aliquots free of red cells Note: May not be able to do add-ons and re-testing. |
| Rejection Criteria | Hemolyzed, Insufficient quantity, Specimen older than stability limits, Gross Lipemia, Serum/plasma not separated from red cells when no physical gel separator layer is present |
| Avail. Stat | NO |
| Analytic Time | 1 Day |
| Methodology | Enzymatic |
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 |
|---|---|---|---|---|---|---|---|---|---|
| Homocysteine, Total | ALL | <15.0 | <15.0 | umol/L |