4T Score for Heparin-induced Thrombocytopenia (HIT)

Clinical scoring system to differentiate patients with HIT from those with other causes for thrombocytopenia.

Thrombocytopenia
+0
Timing of Platelet Count Fall
+0
Thrombosis or other sequelae
+0
Other causes for thrombocytopenia
+0
Derivation Reference:

Lo, G.K., Juhl, D., Warkentin, T.E., Sigouin, C.S., Eichler, P., Greinacher, A. Evaluation of Pretest Clinical Score (4 T’s) for the Diagnosis of Heparin-Induced Thrombocytopenia in Two Clinical Settings. Journal of Thrombosis and Haemostasis 4, no. 4 (April 1, 2006): 759–65. doi:10.1111/j.1538-7836.2006.01787.x.

Validation Reference:

Lo, G. K., D. Juhl, T. E. Warkentin, C. S. Sigouin, P. Eichler, and A. Greinacher. Evaluation of Pretest Clinical Score (4 T’s) for the Diagnosis of Heparin-Induced Thrombocytopenia in Two Clinical Settings. Journal of Thrombosis and Haemostasis 4, no. 4 (April 1, 2006): 759–65. doi:10.1111/j.1538-7836.2006.01787.x.