4Ts Score for Heparin-Induced Thrombocytopenia

Differentiates patients with HIT from those with other causes of thrombocytopenia.


Timing of Platelet Count Fall

Thrombosis or other sequelae

Other causes for thrombocytopenia


Source: Lo GK, Juhl D, Warkentin TE, Sigouin CS, Eichler P, Greinacher A. Evaluation of pretest clinical score (4 Ts) for the diagnosis of heparin-induced thrombocytopenia in two clinical settings. J Thromb Haemost 2006; 4: 759–65.