“…However, rather than relying on any test in clinical practice, for reasons such as drug-related side effects (dyspnea, arrhythmia, etc. ), major and minor bleeding complications, newly started anticoagulant drugs, drug incompatibility or emerging clinical conditions such as previous stroke; de-escalation of potent antiaggregant to classical clopidogrel appears to be applied [ 8 ]. As a matter of fact, in our patient, de-escalation was applied to clopidogrel due to the major bleeding complication in hospitalization without any PFT or genetic testing.…”