| Ordering Code | 113 |
|---|---|
| Test Name | Factor VIII Assay |
| Alias | Factor VIII, Functional Factor VIII Activity Coagulation Factor VIII Factor 8 |
| 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 well |
| Handling Instructions | Plasma must be double centrifuged, separated, and frozen at -20 deg. C immediately. Do NOT thaw once specimen is frozen. |
| Transport Requirements | Preferred method of transport is frozen plasma. |
| Specimen Stability | Ambient: 4 hours Whole Blood (unopened tube) Ambient: 4 hours Plasma Frozen: 2 weeks Plasma |
| Rejection Criteria | Clotted, Contaminated, Hemolyzed, Improperly filled or underfilled tube, Specimen older than stability limits. |
| Avail. Stat | NO |
| Analytic Time | 1 Day |
| Methodology | Clot Detection |
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 |
|---|---|---|---|---|---|---|---|---|---|
| Factor VIII Assay | ALL | 50-200 | 50-200 | % |