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4Ts Score

Pretest probability of heparin-induced thrombocytopenia (HIT) from four clinical criteria — its main value is a low score's ability to rule HIT out.

For healthcare professionals.These calculate a score or a measurement from values you enter. They do not diagnose, and they are no substitute for clinical judgement. If you are a patient, discuss any result with your own doctor rather than acting on it.

Thrombocytopenia (magnitude of platelet fall)

Timing of platelet fall

Thrombosis or other sequelae

oTher causes of thrombocytopenia

Enter the values above to see the result.

Source

Lo GK, Juhl D, Warkentin TE, Sigouin CS, Eichler P, Greinacher A. Evaluation of pretest clinical score (4 T's) for the diagnosis of heparin-induced thrombocytopenia. J Thromb Haemost. 2006;4(4):759-765.

Shown for reference and checked against the source above. Confirm against current guidance before acting on it, and use your own clinical judgement.

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