von Willebrand Antigen

Centralized Core Laboratory:Hematology

Test ID/Workstation: VWFAG SPCOG

Specimen Type: Blood

Tube Type: Blue top (sodium citrate) tube

Collection Volume: 2.7 mL (minimum 1.8 mL)

Must use appropriate sodium citrate tube based on volume of blood drawn (1.8 mL or 2.7 mL tube)

Cause for rejection: Sample hemolyzed, clotted, diluted with IV fluid; contaminated with heparin; improperly filled; not kept on ice; received > 1 hour after drawn

Storage: Frozen

Availability: Mon-Fri (0700-1400)

Methodology: Electroimmunodiffusion Assay (EIA)

Special Instructions: To determine Von Willebrands disease, other recommended testing includes: Factor VIII, Ristocetin Cofactor, APTT

If collected at an offsite location, send by a STAT Courier to Hospital lab.

Lab/Phone: 330-543-8416

TAT: 2 weeks

Additional Info: Reference range:

Normal: 50-160%

CPT Code: 85244

Synonyms: Antigenic Factor VIII; Factor VIII Related Antigen

Requisition Form
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