A cikin shekara ta 1962, an cimma yarjejeniya game da ƙididdigar abubuwan I-XII. Wannan kwamitin ya samo asali a cikin kwamitin na yau da kullum na Thrombosis da Hemostasis (ICTH). Ƙididdigar ƙididdiga ya ƙare a 1963 bayan da aka kira Factor XIII. An ba da sunayen Fletcher Factor da Fitzgerald Factor zuwa wasu sunadaran da suka danganci coagulation, wato prekalreinlik da kuma kininogen mai nauyin kwayoyin halitta. Factors III da VI ba a sanya su ba, kamar yadda ba a taɓa gano thromboplastin ba, kuma a zahiri sun ƙunshi ƙarin abubuwa goma, kuma an gano cewa an kunna su Tambaya ta V: Wane ne ya yarda ya yi amfani da sunaye ko ƙididdigar Roman?
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