Home
HelpTest Code vWF Act von Willebrand Factor Activity Monitoring
Useful For
Monitoring of patients receiving von Willebrand factor activity replacement.
Collection Method
Venipuncture
Minimum Volume
1.8mL
Container
Light-blue top (3.2% sodium citrate)
Preferred Specimen
Properly filled 9:1 ratio (blood to anticoagulant) 3.2% Sodium Citrate tube
Acceptable Specimens
Light-blue Sodium Citrate
Reference or Target Ranges
50.0 - 163.4 %
Reportable Units
Percentage (%)
Reasons for Rejection
| Hemolysis: | Visibly unacceptable |
| Icterus: | Visibly unacceptable |
| Lipemia: | Visibly unacceptable |
| Other: | Short or over drawn tubes, clotted, improperly labled, samples >4hrs of collection, and other qualified reasons deemed appropriate from lab personnel. |
Specimen Stability
| Ambient: | 4 hrs |
| Refrigerated (2°- 8°C): | N/A |
| Frozen ( ≤ 0°C): | 2 weeks @ -20°C; 1 year @ -70°C |
Performance Information
| Days and Times Performed: | Daily, 7am - 3pm |
| Expected Turnaround Time: | Within 1 hour between performing times; or next day |
| Stat Availability: | None |
| Performing Lab: | Coagulation |
| Instrument: | Werfen ACL TOPS |
| Methodology: | Latex Immunoturbidimetric Assay |