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von Willebrand Factor Antigen (VWAG)
MessageOvernight fasting is preferred.
Test Code
LAB757
Quest Code
4919
Alias/See Also
VWAG
CPT Codes
85246
Preferred Specimen
1 mL frozen platelet-poor plasma collected in 3.2% sodium citrate (light blue-top) tube
Minimum Volume
0.5 mL
Instructions
Separate plasma and freeze upon receipt in laboratory.
Transport Container
Transport tube
Transport Temperature
Frozen
Specimen Stability
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 30 days
Refrigerated: Unacceptable
Frozen: 30 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolysis; Received refrigerated or room temperature at reference lab
Methodology
Immunoturbidimetric Assay
Setup Schedule
Wed, fri
Report Available
4-8 days
Reference Range
50-217 %
Clinical Significance
von Willebrand Disease is the most common hereditary bleeding disorder; it may also be acquired. von Willebrand Factor is necessary for platelet adhesion to injured endothelium. von Willebrand Factor Antigen is useful in assessing the quantity of von Willebrand Factor. When combined with other tests, results are useful in categorizing the type of von Willebrand Disease.
Performing Laboratory
| Quest Diagnostics Nichols Institute-Chantilly VA |
| 14225 Newbrook Drive |
| Chantilly, VA 20151-2228 |
