The University of Iowa (UIHC)
Department of Pathology
LABORATORY SERVICES HANDBOOK

Von Willebrand Factor Assay (FVIIIR:RCF)
Order Code: VWFA
Order Form: A-1a Miscellaneous Request or IPR Req 		  Hemostasis/Thrombosis
6240 RCP
356-3573 
Specimen
 
Plasma
Collection Medium:
Light Blue top tube (Na Citrate) 


Minimum:


Full draw; any size blue top (mix well).  Measured as ristocetin
cofactor activity in agglutination of fixed washed platelets.


Testing Schedule:


0800-1630 Monday through Friday.  For additional services, 
contact Clinical Pathology Resident on-call at pager #3404.


Reference Range:


40-164%


Comments:


This test needs a separate tube!  It CANNOT be done with any other 
coagulation tests.  Must have Hematology Consult approval from pager 
4326.


Methodology:


A coagulation instrument measures the change in absorbance.


CPT Code:


85245


 


See Additional Information:
Phlebotomy Tubes and Order of Draw




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Updated: 10/11/2007

Note: The information contained in this handbook is  
            for use by personnel of University of Iowa Health Care. 
            No other use is implied or intended.