Ordering Recommendation

Order in conjunction with von Willebrand Factor Activity (Ristocetin Cofactor) (0030250) and Factor VIII, Activity (0030095) as part of initial workup for suspected von Willebrand disease.

Mnemonic

VWF/AG

Methodology

Microlatex Particle-Mediated Immunoassay

Performed

Mon-Sat

Reported

1-3 days

New York DOH Approval Status

This test is New York DOH approved.

Specimen Required

Patient Preparation
Collect

Lt. blue (sodium citrate). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.

Specimen Preparation

Transfer 1.5 mL platelet-poor plasma to an ARUP Standard Transport Tube. (Min: 1 mL)

Storage/Transport Temperature

CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.

Unacceptable Conditions

Serum EDTA plasma, clotted or hemolyzed specimens.

Remarks
Stability

Ambient: 4 hours; Refrigerated: Unacceptable; Frozen at -20°C: 3 months; Frozen at -70°C: 6 months

Reference Interval

Age Reference Interval
0-6 years 52-214%
7-9 years 62-180%
10-11 years 63-189%
12-13 years 60-189%
14-15 years 57-199%
16-17 years 50-205%
18 years and older 52-214%

Interpretive Data



Compliance Category

FDA

Note

Hotline History

N/A

CPT Codes

85246

Components

Component Test Code* Component Chart Name LOINC
0030285 von Willebrand Factor, Antigen 27816-8
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • Von Willebrand Ag
  • VWF Ag
von Willebrand Factor Antigen