Immune System

Thrombin-Antithrombin TAT

Optimal Result: 0 - 4 mcg/L.

The Thrombin-Antithrombin Complex keeps clotting in check.

Thrombin-Antithrombin (TAT) Complex is a parameter of coagulation (= the process by which a blood clot is formed in order to stop bleeding) and fibrinolysis (= prevents blood clots that occur naturally from growing and causing problems).

Deficiencies may aid in understanding hypercoagulable states. Elevated concentrations have been associated with vascular complications associated with diabetes.

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The presence of TAT indicates ongoing thrombin formation and the consumption of antithrombin. Upon activation of coagulation, antithrombin complexes with thrombin as well as other serine proteases.

Complex formation is greatly enhanced by the presence of heparin or other glycosaminoglycans. The reaction initially is reversible, but becomes irreversible following the formation of a covalent bond between antithrombin and thrombin. This binding results in complete inhibition of thrombin's activity.
A normal TAT level in the presence of an elevated D-dimer may indicate an old thrombus.

References:

Harenberg, J. (1999). Thrombin-antithrombin (TAT) complexes. In: Jespersen, J., Bertina, R.M., Haverkate, F. (eds) Laboratory Techniques in Thrombosis — a Manual. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4722-4_22

What does it mean if your Thrombin-Antithrombin TAT result is too low?

Deficiencies may aid in understanding hypercoagulable states.

TAT levels are markedly reduced in the first 24 hours after receiving oral anticoagulants. The TAT assay can detect the intravascular generation of thrombin and provides valuable information in diagnosing thrombotic events. Decreasing TAT levels can also indicate the resolution of a thrombotic event.

What does it mean if your Thrombin-Antithrombin TAT result is too high?

Elevated TAT measurements may be accompanied by increased levels of prothrombin fragment 1+2, fibrinpeptide A, fibrin(ogen)degradation products, and D-dimer. D-dimer has greater sensitivity for detection of deep venous thrombosis.

Elevated concentrations have been associated with vascular complications associated with diabetes.

Elevated levels of TAT may also be associated with:

- advancing age,

- pregnancy,

- septicemia,

- disseminated intravascular coagulation,

- multiple traumas,

- acute pancreatitis,

- acute and chronic leukemia,

- Pre-eclampsia,

- acute and chronic liver disease,

- and other predisposing causes of thrombosis.

Increased levels are also reported during heparin and fibrinolytic therapy.

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