The DAPT score was derived from the DAPT trial of more than 11,000 patients. A score of 2 or more favours prolonged dual antiplatelet therapy; below 2, the bleeding risk outweighs the ischaemic benefit.
How to use the DAPT Score Calculator
- Age
- Cigarette smoking
- Diabetes
- Heart attack at presentation
- Prior PCI or prior heart attack
- Paclitaxel-eluting stent
- Stent diameter under 3 mm
- Heart failure or LVEF under 30%
- Vein graft stent
Results update as you type, and every field accepts the units shown in its menu.
How it works
Each answer carries the points shown in the published score. The calculator adds them up and maps the total to the published interpretation.
Scoring table
| Item | Answers and points |
|---|---|
| Age | Under 65 = 0; 65–74 = -1; 75 or older = -2 |
| Cigarette smoking | No = 0; Yes = 1 |
| Diabetes | No = 0; Yes = 1 |
| Heart attack at presentation | No = 0; Yes = 1 |
| Prior PCI or prior heart attack | No = 0; Yes = 1 |
| Paclitaxel-eluting stent | No = 0; Yes = 1 |
| Stent diameter under 3 mm | No = 0; Yes = 1 |
| Heart failure or LVEF under 30% | No = 0; Yes = 2 |
| Vein graft stent | No = 0; Yes = 2 |
Inputs explained
| Field | What to enter |
|---|---|
| Age | Choose one: Under 65, 65–74, 75 or older |
| Cigarette smoking | Choose one: No, Yes |
| Diabetes | Choose one: No, Yes |
| Heart attack at presentation | Choose one: No, Yes |
| Prior PCI or prior heart attack | Choose one: No, Yes |
| Paclitaxel-eluting stent | Choose one: No, Yes |
| Stent diameter under 3 mm | Choose one: No, Yes |
| Heart failure or LVEF under 30% | Choose one: No, Yes |
| Vein graft stent | Choose one: No, Yes |
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
Score = sum of the points for each item
Worked example
Inputs — Age: Under 65; Cigarette smoking: No; Diabetes: No; Heart attack at presentation: Yes; Prior PCI or prior heart attack: No; Paclitaxel-eluting stent: No; Stent diameter under 3 mm: No; Heart failure or LVEF under 30%: No; Vein graft stent: No.
Results — DAPT score = 1; Interpretation = Score below 2 – bleeding risk likely outweighs benefit of prolonged DAPT.
Key terms
- PCI
- Percutaneous coronary intervention (stenting).
- DAPT
- Dual antiplatelet therapy.
Frequently asked questions
What is DAPT?
Dual antiplatelet therapy: aspirin plus a P2Y12 inhibitor such as clopidogrel or ticagrelor.
When is the DAPT score used?
After 12 months of uneventful DAPT following a stent.
Can the score be negative?
Yes – older age lowers the score because bleeding risk rises.