Which test is most specific for detecting myocardial injury in the evaluation of chest pain?

• A. Creatinine kinase (CK) alone.
• B. Myoglobin with basic metabolic panel.
• C. Troponin testing detects myocardial injury and rises within 3-4 hours.
• D. Lipid panel.

Answer: (C)

Troponin testing is the most specific for detecting myocardial injury because cardiac troponin I and T are proteins found almost exclusively in heart muscle and are released into the bloodstream when heart cells are damaged. They rise within about 3–4 hours after injury and stay elevated for a period, providing a reliable signal of myocardial injury even when symptoms are not ongoing. Other options lack this specificity: CK can rise from skeletal muscle injury as well, myoglobin is an early but non-specific marker, and a lipid panel assesses long-term risk rather than acute injury. In the chest-pain setting, troponin offers the best indication of myocardial damage.