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HelpTest Code LAB20459 Von Willebrand Factor Antigen
Department
SEND OUTS
Reference Lab Test Number
WVFAP
Collection Requirements
Coagulation Collection Procedure
See appendices for coagulation test collection instructions.
If possible, stop heparin therapy before the draw to avoid contamination. Heparin interferes with most clotting assays.
Refer To
Primary Collection Container
BLUE 2.7 ML (CITRATE)
Transport
Platelet-poor plasma frozen
Preferred Transport Temperature
Frozen
Processing
CRITICAL FROZEN.
Send 1.5 mL plasma frozen in a screw-capped plastic vial.
Stability
Ambient: 4 hours
Refrigerated: Unacceptable
Frozen: 3 months
Minimum Testing Volume
1.0 mL
Reference Range
0-6 years: 52-214%
7-9 years: 62-180%
10-11 years: 63-189%
12-13 years: 60-189%
14-15 years: 57-199%
16-17 years: 50-205%
18 years and older: 52-214%
Methodology
Microlatex Particle-Mediated Immunoassay
Performed
Monday – Saturday
Reported
5-7 days
CPT Codes
-85246