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VON WILLEBRAND ANTIGEN
MessageCollect a full tube to the fill line, following standard venipuncture techniques. Do not over or under fill tubes as the ratio of blood to anticoagulant (9: 1) is necessary for accurate results. Gently Invert the tube three or four times immediately after venipuncture to ensure proper mixing of blood and anticoagulant.
Test Code
LAB757 VWAG
Alias/See Also
VWAG
CPT Codes
85246
Instructions
Processing Instructions (Lab use only): Within 1 hour of collection, centrifuge, transfer all plasma into a plastic vial, and centrifuge plasma again. Aliquot plasma into separate plastic vial and freeze immediately (no longer than 4 hours after collection) at -20° C.Minimum Testing Volume: 1 mL (plasma) Transport Temperature: Frozen Stability: Ambient: 4 hours Refrigerated : UnacceptableFrozen: (-20 °C): 2 weeks or (-70 °C): 1 month Causes for Rejection: Specimens submitted Refrigerated or greater than 4 hours after collection at room temperature, are short draws, clotted or have excessive hemolysis, icterus or lipemia.
Report Available
STAT 24-Hours|Routine 24-Hours|Timed 24-Hours
Clinical Significance
1230140115
Last Updated: May 18, 2026