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Laboratory Test Directory

Von Willebrand Disease VWF Exon 28 Sequence Analysis (2A, 2B, 2M)


Name Method Department Units
VWF Exon 28 Seq. Analysis Polymerase chain reaction (PCR)
DNA sequencing
Send Out Genetics

Battery Members

VWD Type 2A, 2B, 2M Exon 28 Sequence Analysis

Specimen Requirements

Whole blood

Container Type Container Size Specimen Volume

Purple tube (EDTA)

6 mL 5 mL

Room temperature - 48 hour(s)
Refrigerated - 4 week(s)

Specimen Preparation

  • Transport to laboratory as soon as possible
  • Do not centrifuge
  • Do not freeze

Reasons for Rejection

  • Frozen specimen
  • Clotted specimen
  • Centrifuged specimen
  • Delayed or improper handling
  • Wrong collection tube


Sequencing of exon 28 of the VWF (Von Willebrand Factor) gene. Analytical sensitivity is >99% for sequence variations in exon 28 of VWF.  Please complete attached requisition and send to the send out lab with the sample. 

CPT Code

  • 81403