Haematology

4Ts Score for HIT

Probability of heparin-induced thrombocytopenia.

Education and reference only. Not a substitute for clinical judgement, local policy or product labelling. Always verify before clinical use. Values are calculated in your browser and never stored.

When to use

Use when HIT is suspected to estimate its probability and guide whether to stop heparin and test.

Why use

A low score makes HIT very unlikely, avoiding unnecessary anticoagulant changes.

Evidence & references

  1. Lo GK et al. Evaluation of pretest clinical score (4 T’s) for HIT. J Thromb Haemost. 2006.

About the creator

Lo GK, Warkentin TE et al.

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