Laboratory Services
Von Willebrand Factor Antigen
Print this pageUpdated Test Information:
| Test Description |
Von Willebrand Factor Antigen
|
|
|---|---|---|
| Synonym(s) |
Factor 8 Related Antigen, Factor VIII Related Antigen, UOW1513 |
|
| Test ID |
VWFAG
|
|
| General Information |
Clinical assay interference and limitations: The presence of rheumatoid factor may lead to an over-estimation of the vWF level. The extremely rare presence of anti-bovine albumin or anti-rabbit antibodies in certain subjects may lead to an over-estimation of vWF level. Like all antigenic tests, the vWF assay cannot detect the rare type 2 von Willebrand disease variants whose level of vWFAg is normal. |
|
| Container Type |
3 or 5 mL Blue Top (CITRATE) tube |
|
| Specimen Type |
Plasma |
|
| Specimen Requirements |
Sample must be centrifuged, aliquoted and frozen within 4 hours of collection |
|
| Specimen Collection / Processing Instructions |
Centrifuge for 10 minutes, remove plasma & re-spin plasma for another 10 minutes. Decant & Freeze plasma (minimum 1.0 mL) @ -20°C to -80°C. Send frozen on dry ice |
|
| Stability |
Frozen |
|
| Department (code) |
Coagulation |
|
| Methodology |
Optical, Stago STA LIA vWF Antigen assay |
|
| Testing Schedule |
Tuesday |
|
| CPT Code(s) |
85246 |
|
| Reference Range |
Units: % 50-200 Effective date: 10/03/2006 |
|
| Performing Lab |
UW |
|
| LOINC Code(s) |
