4-T Score for the Likelihood of Heparin Induced Thrombocytopenia
 - Thrombocytopenia - Compare the highest platelet

count within the sequence of

declining counts to the lowest. 
 - Timing (of platelet fall or thrombosis)
 - Thrombosis
 - Other potential cause of Thrombocytopenia 

0 to 3 points: Low probability (risk of HIT <1 percent) 
4 to 5 points: Intermediate probability (risk of HIT ~14%) 
6 to 8 points: High probability (risk of HIT ~68%) 


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