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



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