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  • Title: Stability of canine factor VIII activity and von Willebrand factor antigen concentration in vitro.
    Author: Mansell PD, Parry BW.
    Journal: Res Vet Sci; 1991 Nov; 51(3):313-6. PubMed ID: 1780587.
    Abstract:
    The in vitro stability of canine factor VIII activity, von Willebrand factor antigen concentration and the ratio of these two factors was studied. Samples were stored for up to 48 hours, either as plasma or as whole blood, at 4 degrees, 20 degrees and 37 degrees C. Factor VIII activity was generally stable in both plasma and whole blood samples for up to 48 hours at 4 degrees or 20 degrees C. The concentration of von Willebrand factor antigen was more stable in samples stored as plasma than whole blood, and for a shorter time than factor VIII activity. Consequently, the stability of the ratio of these two factors was relatively poor in vitro.
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