VonWillebrand Factor Antigen

Method Name



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


Reference Values

42.0-176.3 %