DAPT Score Calculator
Use this tool to estimate the DAPT score for patients who have completed 12 months of dual antiplatelet therapy (DAPT) after coronary stent placement. This score helps frame the discussion around continuing DAPT beyond one year.
What is the DAPT score?
The DAPT (Dual Antiplatelet Therapy) score is a clinical tool used after coronary stent placement to estimate whether extending DAPT beyond 12 months may provide more benefit than harm. Specifically, it helps balance:
- Ischemic risk (for example, MI or stent thrombosis), versus
- Bleeding risk associated with prolonged antiplatelet treatment.
In practice, the DAPT score is one part of a broader clinical decision. It should be interpreted alongside patient history, bleeding profile, comorbidities, medication tolerance, and current cardiology guidelines.
How scoring works
Each clinical feature contributes a number of points. Older age decreases the score, while factors associated with recurrent ischemic events increase it.
| Factor | Points |
|---|---|
| Age 65–74 years | -1 |
| Age ≥75 years | -2 |
| Current smoker | +1 |
| Diabetes mellitus | +1 |
| MI at presentation | +1 |
| Prior MI or prior PCI | +1 |
| Stent diameter <3 mm | +1 |
| Paclitaxel-eluting stent | +1 |
| CHF or LVEF <30% | +2 |
| Saphenous vein graft PCI | +2 |
General interpretation
- Score ≥ 2: often suggests a more favorable risk-benefit profile for prolonged DAPT in appropriately selected patients.
- Score < 2: often suggests less net benefit and relatively greater concern for bleeding with extended therapy.
When to use this calculator
The DAPT score is typically considered in patients who are:
- approximately 12 months out from PCI with stent placement,
- currently on DAPT without major bleeding complications, and
- being evaluated for whether to continue or stop therapy beyond one year.
It is not a stand-alone rule and should not be used in isolation, especially in complex patients such as those with active bleeding, need for anticoagulation, severe anemia, recent surgery, or other high-risk conditions.
Practical clinical context
What the score captures well
- Several key predictors of ischemic recurrence after PCI
- A structured framework for shared decision-making
- A common language for discussing extended DAPT in clinic
What it does not fully capture
- All bleeding determinants (frailty, prior intracranial hemorrhage, active cancer, etc.)
- Concurrent oral anticoagulant use and changing guideline recommendations
- Patient values, medication cost, and adherence challenges
Example use case
Suppose a 62-year-old patient had PCI for MI, has diabetes, and a small-diameter stent. The score might be:
- Age under 65: 0
- MI at presentation: +1
- Diabetes: +1
- Stent diameter < 3 mm: +1
Total = 3, which would generally support discussing potential benefit from continuing DAPT beyond 12 months if bleeding risk is acceptable.
FAQ
Does a high score mean treatment is mandatory?
No. A higher score suggests potential net benefit, but final treatment still depends on individualized bleeding risk and clinician judgment.
Can this replace a formal bleeding score?
No. Consider complementary bleeding-risk tools and clinical history when making antiplatelet duration decisions.
Is this calculator for emergency diagnosis?
No. It is for follow-up risk stratification and treatment planning, not emergency care.
Bottom line
The DAPT score is a practical way to estimate whether extending dual antiplatelet therapy after PCI might be helpful. Use it as a structured conversation tool—not as a standalone directive—and always integrate clinical context before making medication decisions.