A
5200 Harry Hines Blvd.
,
Dallas
,
TX
75235
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General Information
Alias: vWF Assay, Ristocetin Cofactor Activity
Performed: Wednesday
Turn Around Time: 1-7 days
CPT Codes: 85245
Performed By: Hematology
Notes: Test offered after hours with Pathologist approval.
Clinical Utility: Determination of ristocetin cofactor activity of von Willebrand factor through platelet agglutination
Unacceptable Conditions: Clotted specimens
Components
Name |
Method |
Sex |
Age Range |
Ref. Range Low |
Ref. Range High |
Units |
v Willebrand Factor |
Turbidometric
|
|
0 Minutes - Day 1 |
50 |
287 |
% |
v Willebrand Factor |
Turbidometric
|
|
Day 1 - Day 4 |
50 |
287 |
% |
v Willebrand Factor |
Turbidometric
|
|
Day 5 - Day 29 |
50 |
254 |
% |
v Willebrand Factor |
Turbidometric
|
|
Day 30 - Day 89 |
50 |
246 |
% |
v Willebrand Factor |
Turbidometric
|
|
Day 90 - Day 179 |
50 |
206 |
% |
v Willebrand Factor |
Turbidometric
|
|
Day 180 - Day 364 |
50 |
197 |
% |
v Willebrand Factor |
Turbidometric
|
|
1 Year - 5 Years |
60 |
120 |
% |
v Willebrand Factor |
Turbidometric
|
|
6 Years - 10 Years |
44 |
144 |
% |
v Willebrand Factor |
Turbidometric
|
|
11 Years - 16 Years |
46 |
153 |
% |
v Willebrand Factor |
Turbidometric
|
|
17 Years - 150 Years |
50 |
150 |
% |
Specimen Requirements
Type |
Container |
Volume |
Units |
Collection / Delivery |
Storage / Transport |
Off Campus |
Blood |
Blue Na Citrate, 3mL |
|
|
Send to Lab within 4 hrs of collecion. |
Room Temperature |
|