HIT 4T Score Probability Calculator

Calculate heparin-induced thrombocytopenia pretest probability using 4T score: Thrombocytopenia degree, Timing, Thrombosis, other causes.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Calculate heparin-induced thrombocytopenia pretest probability using 4T score: Thrombocytopenia degree, Timing, Thrombosis, other causes

Each component has a specific meaning:

  • 4T score: Thrombocytopenia degree — The 4t score: thrombocytopenia degree recorded for the scenario being assessed.
  • Timing — The timing recorded for the scenario being assessed.
  • Thrombosis — The thrombosis recorded for the scenario being assessed.
  • Other causes — The other causes recorded for the scenario being assessed.

Note: Interpret the hit 4t score result against the thresholds and context described above.

How to Use

Enter the 4T score: Thrombocytopenia degree, Timing, Thrombosis, other causes for the scenario you are assessing. Calculate heparin-induced thrombocytopenia pretest probability using 4T score: Thrombocytopenia degree, Timing, Thrombosis, other causes. Use the hit 4t score result to inform your calculation.

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Frequently Asked Questions