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The majority of carriers of hemophilia A have historically been considered to have normal hemostasis (FVIII:C >50%) and thus not have an increased bleeding tendency. However, our research group has demonstrated that some hemophilia A carriers can experience increased bleeding compared to normal women despite this normal FVIII activity. In our recently published study in adult hemophilia A carriers there was no correlation between FVIII:C, as measured by a one-stage coagulation assay, and bleeding phenotype, as measured by the MCMDM-1 VWD bleeding score. In this follow up study we sought to determine which of these hemophilia A carriers with normal FVIII:C are at risk for bleeding. The goal of this study is to determine the relationship between FVIII assays (one-stage and chromogenic) and thrombin generation with both menstrual bleeding and an overall bleeding tendency.