4T Score for Heparin-Induced Thrombocytopenia Interpretation of the 4T score: 0-3 points: Low probability (<<1%) - No further workup of HITT is indicated (avoid checking heparin-PF4 antibodies). 4-5 points: Intermediate probability (~10%) - Stop heparin & check anti-PF4 antibody titer - Consider therapeutic anticoagulation with non-heparin agent (more on this below). 6-8 points: High probability (50%) - Stop heparin & check anti-PF4 antibody titer - Initiate therapeutic anticoagulation with a non-heparin agent #4TScore #HITT #HeparinInduced #Thrombocytopenia #Diagnosis #Criteria #Hematology
