ARUP's Laboratory Test Directory

0030125: von Willebrand Panel

Test Mnemonic: VW PANEL
Methodology: Clotting/Platelet Agglutination/Microlatex Particle-Mediated Immunoassay

Performed: Mon, Wed, Fri

Reported: 1-4 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.

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

Pediatric Collection/Transport: 2 mL platelet-poor plasma, frozen.

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

Unacceptable Conditions: Serum.  Nonfrozen or hemolyzed specimens.

Stability: Ambient: 4 hours; Refrigerated: 4 hours; Frozen: 2 weeks

Reference Interval:
 
Test Number Components Reference Interval
0030095Factor VIII, Activity 0-6 years: 56-190%
7-9 years: 78-199%
10-11 years: 83-226%
12-13 years: 74-205%
14-15 years: 69-241%
16-17 years: 63-225%
18 years and older: 56-190%
0030285von Willebrand Factor Antigen 0-6 years: 51-185%
7-9 years: 62-176%
10-11 years: 61-201%
12-13 years: 61-186%
14-15 years: 57-204%
16-17 years: 51-211%
18 years and older: 51-185%
0030250von Willebrand Factor Activity (Ristocetin Cofactor) 0-6 years: 44-195 %
7-9 years: 51-172%
10-11 years: 61-195% 
12-13 years: 47-183%
14-15 years: 50-215 %
16-17 years: 47-206%
18 years and older: 44-195%

CPT Code(s):
85240 F8; 85246 vWF/Ag; 85245 vWF