von Willebrand Factor Activity (Ristocetin Cofactor)
Age
Reference Interval
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%
Interpretive Data
Background information for test. May include disease information, patient result explanation, recommendations, details of testing, associated diseases, explanation of possible patient results.
Compliance Category
FDA
Note
Additional information related to the test.
If von Willebrand ristocetin cofactor (RCF) or von Willebrand factor antigen (vWF Ag) or Factor VIII is low, von Willebrand Multimeric Analysis testing will be added. If the ratio of RCF/vWF Ag is less than 0.7, vW Multimeric Analysis testing will be added.
Hotline History
N/A
CPT Codes
The American Medical Association Current Procedural Terminology (CPT) codes published in ARUP's Laboratory Test Directory are provided for informational purposes only. The codes reflect our interpretation of CPT coding requirements based upon AMA guidelines published annually. CPT codes are provided only as guidance to assist clients with billing. ARUP strongly recommends that clients confirm CPT codes with their Medicare administrative contractor, as requirements may differ. CPT coding is the sole responsibility of the billing party. ARUP Laboratories assumes no responsibility for billing errors due to reliance on the CPT codes published.
* 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
Other names that describe the test. Synonyms.
Coag
von Willebrand Profile
von Willebrand Panel with Reflex to von Willebrand Multimeric Analysis
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