How much does platelet mapping or platelet function analysis influence your management, particularly in patients with recurrent ischemic strokes despite being on dual antiplatelet therapy?

P2y12 or cyp2c19 testing when available is a reasonable part of the work up for recurrent strokes on dual antiplatelet. However it is only one aspect of the work up with the rest focusing on uncontrolled risk factors and untreated mechanisms like atrial fibrillation or carotid web or thrombophillia ...