Clopidogrel is one of the drugs that are given to the patients with high risk of heart attack or strokes. It is used to prevent such conditions for the patient with high risk of cardiovascular events. This drug helps in avoiding the blood clotting, and thus minimizing the risk of strokes and heart attacks. The CYP2C19 is one of the genes that come into action when the drug is affecting the blood clotting. It is responsible for the metabolic activity of the gene and more it is mutated more will be the different result of the drug. Thus to know the effects of the drug on the body and to know the impact of the drug during the treatment, Clopidogrel CYP2C19 Sensitivity Test is done.