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Calculators
Health Calculators
Hematology
4T Score (HIT)

4T Score (HIT)

Clinical probability of Heparin-Induced Thrombocytopenia (HIT).

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About 4T Score (HIT)

The 4T Score (HIT) is a widely utilized clinical probability tool designed to assess the pre-test likelihood of Heparin-Induced Thrombocytopenia (HIT). This validated scoring system systematically evaluates patients suspected of HIT based on four key criteria: degree of Thrombocytopenia, Timing of platelet count fall, presence of new Thrombosis or other sequelae, and ruling out oTher causes of thrombocytopenia. By yielding a low, intermediate, or high probability score, the tool aids clinicians in rapid risk stratification. It guides crucial decisions on further diagnostic testing, such as anti-PF4/heparin antibody ELISA, and helps reduce unnecessary laboratory tests, thereby ensuring more efficient resource management and timely, appropriate patient care.

Next Steps
Absolute Neutrophil Count (ANC)
Calculate absolute neutrophil count (ANC) using differential.
Absolute Eosinophil Count (AEC)
Calculate absolute eosinophil count from WBC and differential.
Absolute Lymphocyte Count (ALC)
Assess absolute lymphocyte levels for immune status.
Absolute Reticulocyte Count (ARC)
Raw reticulocyte count adjusted for RBC count.
Reticulocyte Count (Corrected)
Corrected for hematocrit level.
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Hematology Clinical Scores
Hematology Clinical Scores

Assess probability of Heparin-Induced Thrombocytopenia (HIT), DIC, and evaluate age-adjusted D-dimer thresholds.

Medical Disclaimer
This tool is for educational and screening purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.