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  • Title: Carrier detection in hemophilia A: a cooperative international study. II. The efficacy of a universal discriminant.
    Author: Green PP, Mannucci PM, Briët E, Ljung R, Kasper CK, Essien EM, Chediak J, Rizza CR, Graham JB.
    Journal: Blood; 1986 Jun; 67(6):1560-7. PubMed ID: 3085744.
    Abstract:
    Factor VIII (F.VIII) and von Willebrand factor (VWF):Ag data collected by eight laboratories on a total of 336 obligatory carriers of hemophilia A and 137 normal women were used to answer several questions concerning the construction of linear discriminants for carrier detection. It was found: that a "universal" linear discriminant can be constructed which is suitable for use in all laboratories and is nearly as effective as laboratory-specific discriminants; that inclusion of age and ABO blood type data improved the efficacy of these discriminants; that substitution of alternative assays for F.VIII and VWF:Ag did not generally improve the efficacy of the discriminants over that obtained using the bioassay for F.VIII:C and Laurell's immunoassay for VWF:Ag; that linear discriminants were far more effective than discriminants based on the F.VIII:C/VWF:Ag ratio. A step-wise procedure is given which any laboratory may follow in using the universal discriminant for carrier detection.
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