Factor IX an gano shi a cikin 1952 a cikin wani matashi mai fama da cutar haemophilia B mai suna Stephen Kirsimeti (1947<unk>1993). Dr. Rosemary Biggs da Farfesa R.G. MacFarlane a Oxford, UK sun bayyana rashi. Saboda haka, an kira shi Factor Kirsimeti. Kirsimeti ya zauna a Kanada, kuma ya yi yakin neman lafiyar jini har sai ya kamu da cutar AIDS mai alaka da jini a shekara ta 46. Wani sunan madadin don factor shine plasma thromboplastin, wanda wata kungiya mai zaman kanta a California ta ba da ita.
da suka kamu da cutar AIDS da aka samu ta wurin ƙarin jini