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4Ts Score Worksheet for HIT Pretest Probability — result sheet
Add the four 4Ts clinical components into a transparent 0–8 point worksheet for heparin-induced thrombocytopenia assessment.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: 4Ts score = thrombocytopenia points + timing points + thrombosis/sequelae points + other-possible-causes points; low = 0–3, intermediate = 4–5, high = 6–8.
This worksheet keeps the four components of the 4Ts score visible and adds their selected points. It reports the conventional pretest-probability band without presenting the result as a diagnosis or treatment decision.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Platelet-count fall — 3 choices
- Timing of platelet fall — 3 choices
- Thrombosis or sequelae — 3 choices
- Other possible causes — 3 choices
Worked example
| Input | Value |
|---|---|
| Platelet-count fall | high |
| Timing of platelet fall | intermediate |
| Thrombosis or sequelae | low |
| Other possible causes | high |
2 + 1 + 0 + 2 = 5 points, an intermediate pretest-probability band.
Assumptions and limits
- Each selected option represents the clinician's documented interpretation of one 4Ts domain.
- The platelet category considers both the percentage fall and the platelet nadir rather than the current count alone.
- Timing depends on the heparin exposure history and the observed platelet trend.
- Thrombosis or other sequelae require clinical and, when appropriate, imaging confirmation.
- The other-causes field is a structured judgment, not an exhaustive differential diagnosis.
- The score is intended for adult clinical assessment contexts in which the 4Ts framework is appropriate.
- A score cannot confirm or exclude every case and should be interpreted with the local diagnostic pathway.
- This page does not recommend stopping, changing, or starting a medicine.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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