CDOS

von Willebrand Factor Multimers

Test Code: 500148

Performing Lab: LabCorp

CPT Code: 85247 001

Test Link (Copy)

Synonym

vWF multimers

Specimen Type

Plasma, FROZEN

Specimen Container

Blue-top (sodium citrate) tube

Volume

2 mL

Minimum Volume

1 mL

Specimen Handling

Blood should be collected in a blue-top tube containing 3.2% buffered sodium citrate.[1] Evacuated collection tubes must be filled to completion to ensure a proper blood to anticoagulant ratio.[2,3] The sample should be mixed immediately by gentle inversion at least 6 times to ensure adequate mixing of the anticoagulant with the blood. A discard tube is not required prior to collection of coagulation samples.[4,5] 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 alternate 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. Centrifuge and (using a plastic transfer pipette) carefully remove the plasma without disturbing the cells. Transfer the plasma into a LabCorp PP transpak frozen purple tube with screw cap (LabCorp ID 23751). The specimen should be FROZEN immediately and maintained frozen until tested. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Patient Prep

Do not draw from an arm with a heparin lock or heparinized catheter.

Temperature

FREEZE

Methodology

Western Blot

Result Code	Result Name	LOINC
500149	VWF Multimers	6013-7

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