Definitions for factor ix

This page provides all possible meanings and translations of the word factor ix

Princeton's WordNet

  1. Christmas factor, factor IX(noun)

    coagulation factor whose absence is associated with hemophilia B


  1. Factor IX

    Factor IX is one of the serine proteases of the coagulation system; it belongs to peptidase family S1. Deficiency of this protein causes hemophilia B. It was discovered in 1952 after a young boy named Stephen Christmas was found to be lacking this exact factor, leading to hemophilia.

U.S. National Library of Medicine

  1. Factor IX

    Storage-stable blood coagulation factor acting in the intrinsic pathway. Its activated form, IXa, forms a complex with factor VIII and calcium on platelet factor 3 to activate factor X to Xa. Deficiency of factor IX results in HEMOPHILIA B (Christmas Disease).


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