References in periodicals archive ?
Factor IX deficiency (hemophilia B) was found in 15 families (n=17), 4.
Although his coagulation values had been normal prior to surgery, detailed laboratory tests revealed that he had a mild factor IX deficiency (activity: 41%).
Factor IX deficiency affects roughly 15,000 patients in the United States, Europe, Canada and Japan with an annual cost of treatment with recombinant or plasma-derived factor IX approaching $400 million.