Med - #Cardiac #Biomarkers 1. Troponin • Definition: A protein released into the bloodstream when cardiac muscle is damaged. • Clinical Significance: • Best indicator of acute myocardial infarction (MI). • Reference Range: 0–0.4 ng/mL • > 0.4 ng/mL suggests myocardial infarction. • Peak Time: Remains elevated for up to 3 weeks. ⸻ 2. CK-MB (Creatine Kinase–MB Isoenzyme) • Definition: An enzyme released when the heart, muscles, or brain are damaged. • Clinical Significance: •…