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:
-
Detailed instructions (link): Anticoagulant Correction for High Hematocrit
-
Detailed instructions (link): Blue Citrate Tube
- Specimen should be processed within 1 hour – See Processing Instructions below.
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