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Epic Code LAB1230904 von Willebrand Factor Activity (VWF Activity)

Test Name Alias

VWF GPIbM Activity, GP1B, Ristocetin cofactor, VWF Activity, Von Willebrand Factor Activity | | 1230102571

Interface Order Alias

1230904

Clinical Information

Diagnostic automated assay for the quantitative determination of the von Willebrand factor GP1b-binding activity. Utilized for the evaluation of congenital and acquired von Willebrand syndrome. 

Collection Instructions

Specimen Collection: Blood

 

Container(s): 3.2% Na Citrate Tube (blue top)

Preferred Volume to Collect: 2.7 mL (full tube)

Minimum Volume to Collect: 1.8 mL (full tube)

Capillary collect ok: No

Microtainer acceptable: No

 

Collection Instructions:

 

 

Processing Instructions (Laboratory, Outpatient or Off-site collection)

 

Processed Specimen: Platelet Poor Plasma with a platelet count <10 X 109/L

Centrifuge/Spin: Yes

Aliquot: Yes

Processing Instructions:

  • Detailed instructions (link): Preparing Platelet Poor Plasma
  • Separate plasma into 2 – 3 aliquots, minimum of 0.5 mL each.
  • Freeze aliquots in plastic transport tubes immediately.

Transport Temperature:

  • Ambient (up to 1 hour in whole blood state)
  • Frozen (plasma only >1 hour)

Rejection Criteria

Specimen has been thawed

Specimen Stability

Ambient: 1 hour

Frozen: 2 months

Laboratory Retention: 2 months

Test Frequency

Available Monday-Friday, usual TAT 1-4 days.

Reference Range

50-200 %

Performing Department

Coagulation

Performing Department Laboratory Location

Corewell Health Reference Laboratory, Grand Rapids, MI

Methodology

von Willebrand factor GP1bM-binding activity

CPT

85397

CDM Code

3058539701

Epic Test ID

1230102571

LOINC

currently unavailable

Mayo Access Code

currently unavailable

Reviewed Date

2/28/2025

Updated Date

1/17/2023

Orderable Regions

Southwest; West