略語大辞典 [Med] 22 PTT partial thromboplastin time (test) 部分トロンボプラスチン(プロトロンビン活性化物質)時間(試験). partial thromboplastin time (test); elevated PTTs are caused by heparin release from mast cells in an emergencyanaphylactic reaction; in hematology; e.g. a-PTT(activated PTT), the normal range of which in plasma is 22 丸善「略語大辞典」JLogosID : 11856891