Method Name
Immunoturbidometric
Aliases
VonWillebrand Factor Antigen; VWF Ag, VonWillebrand Ag
Specimen Required
Two full 2.7 mL (3.2% sodium citrate) blue top tube. Specimen will be rejected if the tube is underfilled or overfilled.
Specimen Minimum Volume
4.5 mL of blood
Specimen Stability Information
Specimen is stable for 4 hours, if it is not centrifuged or refrigerated. Otherwise the specimen should be centrifuged, the plasma removed, and the plasma frozen in plastic only at -20 degrees C (2 weeks).
Performing Laboratory
LabCorp
Reference Values
42.0-176.3 %