ARUP's Laboratory Test Directory

von Willebrand Modified Panel : 0030284

Mnemonic: VW PANEL 2

Methodology: Platelet Agglutination/Microlatex Particle-Mediated Immunoassay (LIA)
Performed: Mon-Sat
Reported: 1-3 days
Specimen Required: Collect:  Two 5 mL lt. blue (sodium citrate).  Refer to the Hemostasis/Thrombosis Specimens section in the front of this User's Guide for specimen collection instructions.

Storage/Transport Temperature:  4 mL platelet-poor plasma, frozen. (Min: 2 mL) Submit specimen in an ARUP Standard Transport Tube.

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

Unacceptable Conditions:  Serum.  Nonfrozen or hemolyzed specimens.

Stability (collection to initiation of testing):  Ambient: 4 hours; Refrigerated: 8 hours; Frozen: 2 weeks
Reference Interval:
 
Test Number Components Reference Interval
0030285von Willebrand Factor Antigen 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%
0030250von Willebrand Factor Activity (Ristocetin Cofactor) 0-6 years: 51-215%
7-9 years: 52-176%
10-11 years: 60-195% 
12-13 years: 50-184%
14-15 years: 50-203 %
16-17 years: 49-204%
18 years and older: 51-215%

CPT Code(s): 85246 vWF/Ag; 85245 vWF
 
 

 

 

 
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