DAPT Score Calculator

Q: What range can the DAPT score take?

The DAPT score ranges from -2 to 10. It starts from a tiered age term (0, -1, or -2 points) and adds points for up to eight additional clinical risk factors, each worth +1 or +2 points.

Q: Why does older age subtract points instead of adding them?

In the DAPT trial derivation cohort, older patients who continued dual antiplatelet therapy beyond 12 months experienced proportionally more bleeding events without a matching drop in ischemic events, so age was modeled as a negative predictor: age 65-74 subtracts 1 point and age 75 or older subtracts 2 points relative to patients under 65.

Q: What does a DAPT score of 2 or higher mean?

A score of 2 or higher identifies patients in whom the derivation cohort showed the ischemic benefit of continuing dual antiplatelet therapy beyond 12 months generally outweighed the added bleeding risk, supporting a shared decision to extend DAPT (commonly to 18 or 30 months) in appropriate candidates.

Q: Who was studied to derive the DAPT score?

The DAPT score was derived and validated from the DAPT Study (Yeh et al., JAMA 2016), which enrolled patients who had completed 12 months of dual antiplatelet therapy after coronary stenting without a major ischemic or bleeding event — that is, event-free patients being considered for continued versus stopped therapy at the 12-month mark.

Q: How is the DAPT score different from PRECISE-DAPT?

PRECISE-DAPT is calculated at the time of stenting and estimates bleeding risk alone to help set the planned DAPT duration up front. The DAPT score is calculated after 12 months of event-free therapy and weighs ischemic benefit against bleeding risk together, to help decide whether to extend or stop DAPT at that later decision point.

Q: How should clinicians use the DAPT score?

The DAPT score is a shared-decision-making tool for patients who have tolerated 12 months of DAPT without a major bleeding or ischemic event. It supports — but does not replace — a discussion between clinician and patient that also weighs the patient's individual bleeding history, medication tolerance, and preferences.

DAPT Score	Interpretation	Typical Guidance
≥ 2	Ischemic benefit predominates	Extended DAPT (commonly 18–30 months) is reasonable in appropriate candidates
< 2	Bleeding risk predominates	Standard-duration DAPT (~12 months) is typically favored

Predictor	Points
Age ≥ 75	−2
Age 65–74	−1
Age < 65	0
Current cigarette smoker	+1
Diabetes mellitus	+1
MI at presentation	+1
Prior PCI or prior MI	+1
Stent diameter < 3 mm	+1
Paclitaxel-eluting stent	+1
CHF or LVEF < 30%	+2
Saphenous vein graft (SVG) PCI	+2

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Walk-through

How to Use This Calculator

3 steps

1

Enter age and check every risk factor present

Enter the patient's age, then check every applicable box: current smoking, diabetes, MI at presentation, prior PCI or MI, stent diameter under 3 mm, a paclitaxel-eluting stent, CHF or LVEF under 30%, and saphenous vein graft PCI. The calculator updates the score instantly as you check each box.

2

Read the score and recommendation

The DAPT Score tab shows the total score (range -2 to 10) and a plain-language recommendation. A score of 2 or higher favors extending dual antiplatelet therapy beyond 12 months; a score below 2 favors standard-duration therapy.

3

Review the interpretation and item checklist

Switch to the Interpretation tab to see what the threshold means and your full point breakdown, or the Item Checklist tab to double-check every predictor and its point value against the original derivation table before relying on the result.

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Reference

Formula & Methodology

4 formulas

DAPT score (total)

DAPT score = age points + smoker + diabetes + MI at presentation + prior PCI/MI + stent < 3 mm + paclitaxel stent + (2 × CHF/LVEF<30%) + (2 × SVG PCI)

The total is a weighted sum of one tiered age term plus eight binary risk factors. Age is the only term that can be negative; every other checked factor adds either 1 or 2 points. The range runs from -2 (age ≥ 75, no other factors) to 10 (age < 65, every factor checked).

Age term

age ≥ 75 → -2 pts; 65 ≤ age < 75 → -1 pt; age < 65 → 0 pts

Older age subtracts points because the DAPT trial derivation cohort showed older patients who continued therapy past 12 months had proportionally more bleeding events without a matching drop in ischemic events.

Single-point factors

+1 each: current smoker, diabetes, MI at presentation, prior PCI or MI, stent diameter < 3 mm, paclitaxel-eluting stent

Each of these six binary risk factors independently predicted a favorable ischemic-benefit-versus-bleeding-risk tradeoff from continuing DAPT in the derivation cohort, so each adds 1 point when present.

Double-point factors

+2 each: CHF or LVEF < 30%, saphenous vein graft (SVG) PCI

Heart failure/reduced ejection fraction and SVG PCI carried the strongest independent association with ischemic benefit from extended DAPT in the derivation model, so each is weighted twice as heavily as the single-point factors.

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High YMYL

Trust, Methodology & Sources

Reviewed by Calculover Editorial Review · Updated 2026-07-22 · 2 sources

Editorial accountability

Author: Quinn Sumner - Editor

Owner: Quinn Sumner - Editorial owner

Reviewer: Calculover Editorial Review - Clinical-source review

Last reviewed: 2026-07-22

Last verified: 2026-07-22

Data effective: 2026-07-22

Methodology

The calculator implements the DAPT score exactly as published in Yeh RW, Secemsky EA, Kereiakes DJ, et al., JAMA 2016;315(16):1735-1749 — a tiered age term plus eight binary risk factors summed to a total ranging from -2 to 10, with a score of 2 or higher indicating that extended dual antiplatelet therapy's ischemic benefit likely outweighs its bleeding risk.

Assumption: The patient has completed 12 months of dual antiplatelet therapy after coronary stenting without a major bleeding or ischemic event, matching the derivation cohort's eligibility criteria.

Assumption: All nine input variables (age plus eight risk factors) are entered accurately and reflect the patient's status at the 12-month decision point, not at the time of the original stenting procedure.

Limitations & guidance

The DAPT score was derived in a specific trial population and stent-era context; it may not generalize precisely to all modern stent platforms or patient populations.

The score identifies a statistical tendency across a derivation cohort, not a certainty for any individual patient — it does not account for a patient's specific bleeding history, medication interactions, or personal risk tolerance.

This is a shared-decision-making aid, not a mandate. It should never be used as the sole basis for extending or stopping dual antiplatelet therapy without the treating clinician's full clinical assessment.

Professional guidance: This calculator is for education only and is not medical advice, diagnosis, or treatment. The DAPT score supports, but does not replace, the judgment of a licensed clinician evaluating the full clinical picture, including the patient's individual bleeding history and preferences.

Primary sources

Development and Validation of a Prediction Rule for Benefit and Harm of Dual Antiplatelet Therapy Beyond 1 Year After Percutaneous Coronary Intervention (Yeh RW et al., JAMA 2016)

MDCalc — DAPT Score

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Glossary

Key Terms Explained

7 terms

DAPT score A 9-variable clinical prediction score (range -2 to 10) that estimates whether the ischemic benefit of continuing dual antiplatelet therapy beyond 12 months after coronary stenting outweighs the added bleeding risk for a given patient.

Dual antiplatelet therapy (DAPT) The combined use of aspirin plus a P2Y12 inhibitor (such as clopidogrel, prasugrel, or ticagrelor) to prevent stent thrombosis and recurrent ischemic events after percutaneous coronary intervention.

Ischemic risk The risk of a thrombotic cardiac event — such as stent thrombosis, myocardial infarction, or ischemic stroke — that dual antiplatelet therapy is intended to reduce.

Bleeding risk The risk of a major or clinically relevant bleeding event, which rises the longer a patient remains on dual antiplatelet therapy, particularly with advancing age.

PCI (percutaneous coronary intervention) A catheter-based procedure, most often stent placement, used to open a narrowed or blocked coronary artery.

Stent A small mesh tube placed in a coronary artery during PCI to keep it open; drug-eluting stents (including paclitaxel-eluting stents) release medication that reduces the chance of the artery re-narrowing.

Saphenous vein graft (SVG) A segment of leg vein used as a bypass conduit in coronary artery bypass graft surgery; PCI performed on a saphenous vein graft carries a higher risk profile than PCI on a native coronary artery.

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Scenarios

Real-World Examples

3 worked examples

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68-year-old with diabetes and an SVG stent

Score ≥ 2 — extended DAPT favored

Age 68 Diabetes mellitus Yes Current smoker Yes Saphenous vein graft PCI Yes

Age 68 contributes -1 point, diabetes and smoking each add 1 point, and SVG PCI adds 2 points, for a total DAPT score of 3. A score of 3 is at or above the 2-point threshold, so the derivation cohort showed the ischemic benefit of continuing DAPT beyond 12 months generally outweighed the bleeding risk for a patient like this.

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78-year-old with no other risk factors

Score < 2 — standard-duration DAPT favored

Age 78 All other factors None

Age 78 alone contributes -2 points with no other risk factors checked, for a total DAPT score of -2. This is well below the 2-point threshold, so standard-duration therapy (around 12 months) is typically favored rather than extending DAPT.

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61-year-old with a small stent and prior MI

Borderline case at the threshold

Age 61 Prior PCI or prior MI Yes Stent diameter < 3 mm Yes

Age under 65 contributes 0 points, and the two +1 factors (prior PCI/MI, small stent diameter) bring the total to exactly 2 — right at the threshold. A borderline score like this is where the shared-decision-making conversation matters most: the clinician should weigh the score alongside the patient's actual bleeding history and treatment tolerance rather than relying on the number alone.

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Deep Dive

Understanding the DAPT Score Calculator

3 chapters · 4 min read

After 12 months of dual antiplatelet therapy (DAPT) following coronary stenting, clinicians and patients face a decision: stop therapy at 12 months, or continue it for an extended period. The DAPT score, derived from the DAPT Study (Yeh et al., JAMA 2016), quantifies which way that tradeoff likely leans for a given patient by combining nine clinical variables into a single number.

How the DAPT score works

The DAPT score sums a tiered age term with eight binary risk factors. Age is the only variable that subtracts points — patients 65 to 74 lose 1 point, and patients 75 or older lose 2 points, relative to patients under 65. The remaining eight factors (current smoking, diabetes, MI at presentation, prior PCI or MI, stent diameter under 3 mm, a paclitaxel-eluting stent, CHF or LVEF under 30%, and saphenous vein graft PCI) each add 1 or 2 points when present. The resulting total ranges from -2 to 10.

The score was derived by comparing outcomes in patients randomized to continued versus stopped DAPT at the 12-month mark, identifying which combination of baseline characteristics predicted a net ischemic benefit (fewer stent thromboses and heart attacks) versus a net bleeding harm from continuing therapy.

Reading the threshold

A score of 2 or higher identifies patients in whom the derivation cohort showed the ischemic benefit of continuing DAPT generally outweighed the added bleeding risk — supporting a shared decision to extend therapy, commonly to 18 or 30 months total, in appropriate candidates. A score below 2 identifies patients in whom bleeding risk generally predominated, favoring standard-duration therapy of about 12 months.

The score is intended to be read as this binary threshold rather than as a continuous risk percentage — it does not get progressively "more favorable" as the number climbs past 2, it simply crosses from one recommendation zone into the other.

Limits and how it should be used

The DAPT score applies only to patients who have already completed 12 months of DAPT without a major ischemic or bleeding event — it is not a tool for setting the initial planned DAPT duration at the time of stenting (that role belongs to scores like PRECISE-DAPT). It was derived in a specific trial population and stent-era context, so it should be applied alongside, not instead of, an individualized assessment of the patient's actual bleeding history, comorbidities, and preferences. This calculator is for education and shared-decision support only; the final decision to extend or stop DAPT should always be made together with the treating clinician.

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Questions

Frequently Asked Questions

6 questions

What range can the DAPT score take?+

The DAPT score ranges from -2 to 10. It starts from a tiered age term (0, -1, or -2 points) and adds points for up to eight additional clinical risk factors, each worth +1 or +2 points.

Why does older age subtract points instead of adding them?+

In the DAPT trial derivation cohort, older patients who continued dual antiplatelet therapy beyond 12 months experienced proportionally more bleeding events without a matching drop in ischemic events, so age was modeled as a negative predictor: age 65-74 subtracts 1 point and age 75 or older subtracts 2 points relative to patients under 65.

What does a DAPT score of 2 or higher mean?+

A score of 2 or higher identifies patients in whom the derivation cohort showed the ischemic benefit of continuing dual antiplatelet therapy beyond 12 months generally outweighed the added bleeding risk, supporting a shared decision to extend DAPT (commonly to 18 or 30 months) in appropriate candidates.

Who was studied to derive the DAPT score?+

The DAPT score was derived and validated from the DAPT Study (Yeh et al., JAMA 2016), which enrolled patients who had completed 12 months of dual antiplatelet therapy after coronary stenting without a major ischemic or bleeding event — that is, event-free patients being considered for continued versus stopped therapy at the 12-month mark.

How is the DAPT score different from PRECISE-DAPT?+

PRECISE-DAPT is calculated at the time of stenting and estimates bleeding risk alone to help set the planned DAPT duration up front. The DAPT score is calculated after 12 months of event-free therapy and weighs ischemic benefit against bleeding risk together, to help decide whether to extend or stop DAPT at that later decision point.

How should clinicians use the DAPT score?+

The DAPT score is a shared-decision-making tool for patients who have tolerated 12 months of DAPT without a major bleeding or ischemic event. It supports — but does not replace — a discussion between clinician and patient that also weighs the patient's individual bleeding history, medication tolerance, and preferences.

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Patient Variables

DAPT Score & Recommendation

Your Point Breakdown

What Your Score Means

Every DAPT Score Item & Its Point Value

How to Use This Calculator

Enter age and check every risk factor present

Read the score and recommendation

Review the interpretation and item checklist

Formula & Methodology

Trust, Methodology & Sources

Key Terms Explained

Real-World Examples

68-year-old with diabetes and an SVG stent

78-year-old with no other risk factors

61-year-old with a small stent and prior MI

Understanding the DAPT Score Calculator

How the DAPT score works

Reading the threshold

Limits and how it should be used

Frequently Asked Questions

Get a branded PDF of your results

DAPT Score Calculator

Patient Variables

DAPT Score & Recommendation

Your Point Breakdown

What Your Score Means

Every DAPT Score Item & Its Point Value

How to Use This Calculator

Enter age and check every risk factor present

Read the score and recommendation

Review the interpretation and item checklist

Formula & Methodology

Trust, Methodology & Sources

Key Terms Explained

Real-World Examples

Understanding the DAPT Score Calculator

How the DAPT score works

Reading the threshold

Limits and how it should be used

Frequently Asked Questions

Get a branded PDF of your results

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