VON WILLEBRAND ANTIGEN, MULTIMERIC ANALYSIS

Index:

Order Name VON W MULT
Test Number: 1502250
Revision Date 05/11/2026

Obsolete Reason
Effective Immediately, the performing lab has changed the reporting details for LCOK [1502250] (LabCorp tc 500148) Von Willebrand Antigen, Multimeric Analysis Until the New Codes are built out this can be sent out as Miscellaneous New Test for Von Willebrand Multimers LabCorp tc 117245. Plasma from Light Blue Top Tube - Frozen Volume: 2.0mL (min 1.0mL Note: This volume does not allow for repeat testing.) Container: Blue stopper 3.2% sodium citrate plasma evacuated tube Collection: Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate.24 Evacuated collection tubes must be filled to completion to ensure a proper blood-to-anticoagulant ratio.25,26 The sample should be mixed immediately by gentle inversion at least six times to ensure adequate mixing of the anticoagulant with the blood. A discard tube is not required prior to collection of coagulation samples unless the sample is collected using a winged (butterfly) collection system. With a winged blood collection set, a discard tube should be drawn first to account for the dead space of the tubing and prevent under-filling of the evacuated tube.27,28 When noncitrate tubes are collected for other tests, collect sterile and nonadditive (red-top) tubes prior to citrate (blue-top) tubes. Any tube containing an alternative anticoagulant should be collected after the blue-top tube. Gel-barrier tubes and serum tubes with clot initiators should also be collected after the citrate tubes. Please print and use the Volume Guide for Coagulation Testing to ensure proper draw volume. Cause for Rejection: Lipemia; icteric specimen; hemolysis; clotted specimen; specimen contaminated with heparin (i.e., drawn with blood gases)

Obsolete Reason

Effective Immediately, the performing lab has changed the reporting details for LCOK [1502250] (LabCorp tc 500148) Von Willebrand Antigen, Multimeric Analysis

Until the New Codes are built out this can be sent out as Miscellaneous New Test for Von Willebrand Multimers LabCorp tc 117245.

Plasma from Light Blue Top Tube - Frozen
Volume: 2.0mL (min 1.0mL Note: This volume does not allow for repeat testing.)
Container: Blue stopper 3.2% sodium citrate plasma evacuated tube
Collection: Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate.24 Evacuated collection tubes must be filled to completion to ensure a proper blood-to-anticoagulant ratio.25,26 The sample should be mixed immediately by gentle inversion at least six times to ensure adequate mixing of the anticoagulant with the blood. A discard tube is not required prior to collection of coagulation samples unless the sample is collected using a winged (butterfly) collection system. With a winged blood collection set, a discard tube should be drawn first to account for the dead space of the tubing and prevent under-filling of the evacuated tube.27,28 When noncitrate tubes are collected for other tests, collect sterile and nonadditive (red-top) tubes prior to citrate (blue-top) tubes. Any tube containing an alternative anticoagulant should be collected after the blue-top tube. Gel-barrier tubes and serum tubes with clot initiators should also be collected after the citrate tubes. Please print and use the Volume Guide for Coagulation Testing to ensure proper draw volume.
Cause for Rejection: Lipemia; icteric specimen; hemolysis; clotted specimen; specimen contaminated with heparin (i.e., drawn with blood gases)