Troponin Levels and Myocardial Injury

A 52-year-old male patient has been admitted to the hospital with a suspected myocardial infarction (MI). The nursing staff is closely monitoring his laboratory values, particularly the cardiac markers to assess myocardial injury. The patient's initial troponin I level is recorded at 0.15 ng/mL. The healthcare provider has indicated that a significant elevation in troponin levels is expected to be above the normal threshold of ____ ng/mL to confirm myocardial injury.