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Table 1 4Ts Score for Heparin-Induced Thrombocytopenia

From: SARS-CoV-2 and pulmonary embolism: who stole the platelets?

4Ts pretest probability Score 4
Thrombocytopenia Platelet count fall > 50% and platelet nadir > 20 2
Timing of platelet count fall Onset after day 10 of heparin exposure 1
Thrombosis or other sequelae No new thrombosis 0
Other causes for thrombocytopenia Possible other causes 1