HomeNursing questions Normal plasma clot Thrombin time (TT).. 12 - 15 Sec Normal plasma clot Thrombin time (TT): a. 36 - 50 Sec. b. 11 - 16 Sec. c. 12 - 15 Sec.*** d. 1 - 4 min. Facebook Twitter Share:Normal plasma clot Thrombin time (TT).. 12 - 15 Sec Facebook Twitter WhatsApp Pinterest LinkedIn Reddit Tumblr Telegram Email