- VWP
von Willebrand Factor (vWF) Screen
Specimen:
Test Code
VWP
Specimen Name
von Willebrand Factor (vWF) Screen
Collect
3 - Blue Top (Na Citrate)
Submit
4 - 0.5 mL (Min: 2 - 0.5 mL) plasma aliquots
Special Handling
If multiple specimens are collected, adhere to policy for order of draw. Tubes MUST be full. DO NOT overfill or underfill. Tube MUST be mixed immediately after filling with blood. Gently mix tube by inverting 5 to 6 times. If testing cannot be completed within 4 hours, prepare platelet poor plasma and freeze at -20 C.
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.
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, CRITICAL FROZEN.
Methodology
Instrumentation Laboratory ACL Top 750
Performed
Monday- Friday
Reported
1-4 days
CPT Codes
- 85240
- 85244
- 85245
Components
—
Additional Information
The presence of Rheumatoid Factor over 50 IU/mL may produce an overestimation of VW antigen results. DO NOT PUT ALL PLASMA IN ONE ALIQUOT TUBE.
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It is preferable to locate tests on the website and not rely on printed test information, which may soon be out of date.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
How to Label Your Sample
- Label Your Test 1
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- Label Your Test 4
- Label Your Test 5
Common Test Phrases
- Label Your Test 1
- Label Your Test 2
- Label Your Test 3
- Label Your Test 4
- Label Your Test 5
Common Lab Definitions
- Serum
- Plasma
- STT