DAPT score is based on the Dual Antiplatelet Therapy Study and is used to assess the risk/benefit ratio of prolonged dual antiplatelet therapy. Advanced age is given a negative score as it increases the bleeding risk. Age of 75 or above is given two points while age between 65-74 years is given 1 point. Current smoking, diabetes mellitus, myocardial infarction at presentation, previous percutaneous intervention (PCI) or myocarial infarction, stent diameter of less than 3 mm and Paclitaxel eluting stent, all get 1 point each. Congestive heart failure or left ventricular ejection fraction less than 30% and saphenous vein graft PCI get 2 points each.
If the total score is 2 more, the benefit/risk ratio for prolonged dual antiplatelet therapy is favourable. DAPT score below 2 is associated with an unfavourable benefit/risk ratio.