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Thrombin Time (TT)

SI UNITS (recommended)


* The SI unit is the recommended method of reporting clinical laboratory results

TT, Thrombin Clotting Time
Units of measurement
s, sec

The thrombin time (TT) measures the time it takes for clot formation in a plasma to which thrombin has been added. TT test is ordered as part of an investigation of a possible bleeding disorder or thrombotic episode. TT is prolonged by:

▪ Decreased fibrinogen levels (hypofibrinogenemia or afibrinogenemia).

▪ Abnormal function of fibrinogen (dysfibrinogenemia).

▪ Presence of direct thrombin inhibitors like Dabigatran, Bivalirudin and Argatroban.

▪ Presence of heparin.

▪ Presence of Aprotinin.

▪ Fibrinogen/fibrin degradation products and/or increased fibrinolysis e.g. due to thrombolytic therapy.

In newborns TT results above the normal range are observed.

SI units Conversion Calculator. Convert Thrombin Time (TT) level to s, sec. Clinical laboratory units online conversion from conventional or traditional units to Si units. Table of conversion factors for Thrombin Time (TT) unit conversion to s, sec.