TT yana nufin lokacin da jini ke tsayawa bayan ƙara thrombin da aka daidaita a cikin plasma. A cikin hanyar coagulation ta gama gari, thrombin da aka samar yana canza fibrinogen zuwa fibrin, wanda TT za a iya nuna shi. Saboda samfuran lalata fibrin (proto) (FDP) na iya faɗaɗa TT, wasu mutane suna amfani da TT a matsayin gwajin tantancewa don tsarin fibrinolytic.