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Test Code VWFA VON WILLEBRAND FACTOR ANTIGEN

Performing Location

University of Vermont Medical Center

Method

Immunoassay

Reference Range

50 – 185%

Specimen Information

Container

Specimen

Temperature

Collect Vol

Submit Vol

Minimum Vol

Stability
Blue Top Tube Plama Frozen 3.5 mL 2 mL 0.5 mL 6 Months
Blue Top Tube Whole Blood Ambient 3.5 mL 3.5 mL 3.5 mL 3 Hours

Refer to Coagulation Specimen Handling prior before collection. Submit 2 × 0.5 mL frozen plasma aliquots for this test. Draw blood in light blue top tube(s). If sample can be submitted within 3 hours, submit whole blood at ambient temperature. If this is not possible, spin down tube and remove plasma.  Spin plasma again and place citrate platelet-poor plasma in required number of plastic vials (Glass vials cannot be accepted.) Freeze specimen at less than or equal to minus 40° C if possible. Send specimen frozen on dry ice. Each coagulation assay requested should have its own vial.

LOINC Code Information

Result Code Reporting Name LOINC Code
VWFA VWF Antigen 27816-8

 

Instrumentation

ACL Top 500

CPT(s)

Description CPT Code
VWF Antigen 85246

 

Test Schedule / Analytical Time / Test Priority

Tuesday, Thursday / 1 day / Available STAT, nights and weekends with pathologist approval

Section

Coagulation

Is the UVMMC lab NY State Certified to perform this testing?  Yes/No

Yes