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General Information
Alias: vWF Ag
Performed: Wednesday, 0700-1530
Turn Around Time: 1-7 days
CPT Codes: 85246
Performed By: Hematology
Notes:
Results not affected by Hgb up to 120 mg/dL, bilirubin up to 14 mg/dL, triglycerides up to 1500 mg/dL and Rheumatoid Factor (RF) up to 50 IU/mL. The presence of Rheumatoid Factor (RF) may produce an overestimation of the test results.
Pediatric Reference Ranges are from the following publications:
1. Andrew M; Paes; Johnston M
Development of the hemostatic system in the neonate and young infant
American Journal of Pediatric Hematology/Oncology 1990; 12(1): 95-104
2. Andrew M, Vegh P, Johnston M, Bowker J, Ofosu F, Mitchell L.
Maturation of the hemostatic system during childhood.
Blood. 1992 Oct 15; 80(8):1998-200
Clinical Utility: Quantitative determination of Von Willebrand Factor Antigen (VWF antigen) is essential to reach a proper diagnosis of von Willebrand Disease (VWD), congenital bleeding disorder. VWD is classified as type 1 or type 3 (quantitative defects) or type 2 (qualitative defect) depending upon laboratory findings.
Unacceptable Conditions: QNS, clotted, hemolyzed, and/or turbid samples
Components
| Name |
Method |
Sex |
Age Range |
Ref. Range Low |
Ref. Range High |
Units |
| v Willebrand Ag |
Latex based immunoassay |
|
0 Minutes - 4 Days |
50.0 |
287.0 |
% |
| v Willebrand Ag |
Latex based immunoassay |
|
5 Days - 29 Days |
50.0 |
254.0 |
% |
| v Willebrand Ag |
Latex based immunoassay |
|
30 Days - 89 Days |
50.0 |
246.0 |
% |
| v Willebrand Ag |
Latex based immunoassay |
|
90 Days - 179 Days |
50.0 |
206.0 |
% |
| v Willebrand Ag |
Latex based immunoassay |
|
180 Days - 364 Days |
50.0 |
197.0 |
% |
| v Willebrand Ag |
Latex based immunoassay |
|
1 Year - 5 Years |
60.0 |
120.0 |
% |
| v Willebrand Ag |
Latex based immunoassay |
|
6 Years - 10 Years |
44.0 |
144.0 |
% |
| v Willebrand Ag |
Latex based immunoassay |
|
11 years - 16 Years |
46.0 |
153.0 |
% |
| v Willebrand Ag |
Latex based immunoassay |
|
17 Years - 150 Years |
42 |
176 |
% |
Specimen Requirements
| Type |
Container |
Volume |
Units |
Collection / Delivery |
Storage / Transport |
Off Campus |
| Blood |
Blue 3.2% Na Citrate, 3mL |
Draw to fill line |
|
Send to lab within 3 hours of collection |
Room Temperature |
Deliver to Logistics Hematology Lab via STAT courier.
|