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Outcome trials have failed to demonstrate the utility of routine platelet function testing before or after stenting, and such testing carries a class III recommendation (is not recommended) in European and American guidelines. However, monitoring platelet function carries a class IIb recommendation (might be reasonable; level of evidence, C) in certain high-risk situations and has gained popularity among some clinicians, perhaps because selecting and titrating antiplatelet treatment based on a physiological parameter seems sensible. Now, in an industry-funded study, investigators have evaluated the use of platelet function monitoring to adjust antiplatelet treatment after stent placement for acute coronary syndrome in patients aged 75 years…