| Ordering Code | 7738 |
|---|---|
| Test Name | von Willebrand Factor Antigen |
| Alias | vWF Antigen |
| Preferred Specimen | Plasma |
| Preferred Container | Citrate, 3.2% (Lt Blue) |
| Other Specimen/Container | Whole Blood in Citrate, 3.2% (Lt Blue) if testing is done within 4 hours. |
| Optimum Volume | Plasma = 1 mL Whole blood = Entire tube |
| Collection Instructions | Draw full tube. Mix tube(s) well. |
| Handling Instructions | Double centrifuge coag plasma. Separate and freeze immediately. |
| Transport Requirements | Oahu: Frozen Airline: Frozen |
| Specimen Stability | Ambient: 4 Hours Refrigerated: Not Stable Frozen: 2 Weeks |
| Rejection Criteria | Clotted, Contaminated, Hemolyzed, Over filled tube, Specimen older than stability limits, Under filled tube |
| Avail. Stat | NO |
| Analytic Time | 1 Day |
| Methodology | Immuno-turbidimetric |
Reference range(s)
The reference ranges listed below are valid on this date of June 29, 2025.
| Component | Age | Male Norm | Male Critical Low | Male Critical High | Female Norm | Female Critical High | Female Critical Low | Units | Add'l info |
|---|---|---|---|---|---|---|---|---|---|
| von Willebrand Factor Antigen | ALL | 50-160 | 50-160 | % |