- YVNWFA
von Willebrand Factor (vWF) Antigen
Specimen:
Test Code
YVNWFA
Specimen Name
von Willebrand Factor (vWF) Antigen
Collect
Sodium Citrate Plasma. Also Acceptable: One Sodium Citrate tube
Submit
2 - 1 mL aliquots 2 (Min: 2- 0.5 mL) aliquots of plasma, Frozen. OR One full Sodium Citrate tube, Room Temperature (Must be received within four hours).
Special Handling
Tubes MUST be full. DO NOT overfill or underfill. Tube MUST be mixed immediately after filling with blood. Vigorous mixing or shaking may cause hemolysis, which will affect the result. If testing cannot be completed within 4 hours, prepare platelet poor plasma and freeze. DO NOT PUT ALL PLASMA IN ONE ALIQUOT TUBE.
Rejection Criteria
Specimens collected in an anticoagulant other than 3.2% sodium citrate
Under or overfilled specimens
Clotted specimens
Grossly hemolyzed, lipemic, or icteric specimens
Refrigerated or frozen whole blood specimens
Under or overfilled specimens
Clotted specimens
Grossly hemolyzed, lipemic, or icteric specimens
Refrigerated or frozen whole blood specimens
Stability
Room temperature: 4 hours; Frozen -20 C: 1 month
If specimen cannot be tested within 4 hours, prepare platelet poor citrated plasma and freeze plasma in 0.5 mL aliquots
Methodology
Instrumentation Laboratory ACL Top 750
Performed
Monday - Friday
Reported
1-2 days
CPT Codes
- 85246
Components
—
Additional Information
The presence of Rheumatoid Factor over 50 IU/mL may produce an overestimation of VW antigen results.
Disclaimer:
It is preferable to locate tests on the website and not rely on printed test information, which may soon be out of date. Updated test information can only be guaranteed by using this website.
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Test Information
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Common Lab Definitions
- Serum
- Plasma
- STT