“… 8 , 9 While FXII deficiency continues to be the subject of ongoing research and debates, the findings of this case report supported data suggesting that prolonged aPTT may indicate a deficiency in coagulation factors VIII, IX, XI, XII, and von Willebrand factor. 10 , 11 Likewise, in this research, prolonged aPTT was associated with FXII deficiency. Prolonged aPTT may also suggest the presence of an inhibitor, which may be specific, such as anti-factor VIII, or non-specific, such as antiphospholipid antibodies.…”