Normal plasma clot Thrombin time (TT).. 12 - 15 Sec NIL NAM July 02, 2017 Normal plasma clot Thrombin time (TT): a. 36 - 50 Sec. b. 11 - 16 Sec. c. 12 - 15 Sec.*** d. 1 - 4 min. Share This: Facebook Twitter Google+ Stumble Digg