Clinical use
Use this calculator for heparin-induced thrombocytopenia probability in thehematology workflow. It is decision support and should be interpreted with the patient context, local protocols, and clinician judgment.
Calculate 4Ts
Interpretation
Score 0-3: low probability — HIT unlikely. 4-5: intermediate — send HIT assay, consider alternative anticoagulation. 6-8: high — assume HIT, stop all heparin immediately.
Required inputs
- Thrombocytopenia
- Timing Of Platelet Fall
- Thrombosis
- Other Causes
Evidence and limitations
This page cites 1 published reference. Confirm units and inclusion criteria before applying the output; calculators do not replace assessment, escalation, or local policy.
References
- Lo GK et al. J Thromb Haemost 2006;4:759-765
Frequently asked questions
What is the 4Ts Score for HIT?
4Ts Score for HIT is a clinical calculator used for Heparin-induced thrombocytopenia probability.
How do I interpret the 4Ts Score for HIT?
Score 0-3: low probability — HIT unlikely. 4-5: intermediate — send HIT assay, consider alternative anticoagulation. 6-8: high — assume HIT, stop all heparin immediately.
What inputs are required for the 4Ts Score for HIT?
Required inputs include Thrombocytopenia, Timing Of Platelet Fall, Thrombosis, Other Causes.
What is the evidence behind the 4Ts Score for HIT?
The 4Ts Score for HIT page cites Lo GK et al. J Thromb Haemost 2006;4:759-765.
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