Troponin I is a protein found in heart muscle that regulates contraction.

When heart muscle cells are damaged (e.g., during a heart attack), troponin I is released into the bloodstream.

Clinical uses include:

Diagnosing acute myocardial infarction (AMI).

Detecting cardiac injury due to myocarditis, heart failure, or trauma.

Monitoring patients with unstable angina or suspected ischemia.

Assessing risk and prognosis in cardiac patients.

Considered the gold standard biomarker for detecting heart muscle injury.

Analyte: Cardiac Troponin I in serum/plasma (ng/mL).

Normal Range (varies by lab): Typically <0.04 ng/mL.

Abnormal Findings:

Elevated Troponin I: Strongly suggests myocardial injury (heart attack, myocarditis, cardiac trauma).

Serial measurements: Rising/falling pattern confirms acute myocardial infarction.

Clinical Use:

Provides a highly specific and sensitive marker of cardiac injury.

Helps guide emergency diagnosis, treatment, and monitoring of heart disease.

Supports cardiology and emergency medicine evaluations.