Test Overview

Test Methodology


Test Usage

Marker of myocardial injury. Troponin I is one of three proteins of the troponin complex that regulates the calcium mediated interaction of actin and myosin. Troponin I demonstrates slightly better cardiac specificity than does CK-MB. Serum levels of troponin I begin to rise 4 to 8 hours after an acute myocardial infarction, and remain elevated for the next 48 to 72 hours. Troponin I may be elevated in a number of cardiac conditions other than AMI, including unstable angina.

Reference Range*

< 0.20 ng/mL

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details

Days Test Performed

Daily, 24 hours

Soft Order Code


MiChart Code

Troponin, Point of Care




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Chemical Pathology

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Specimen Requirements

Additional Information

All Troponin requests from the ER will be performed on the i-STAT analyzer. Troponin values greater than or equal to 0.20 ng/mL are considered abnormal by this method. Please note that this reference range differs from that of the Chemistry Lab Troponin-I assay (<0.30 ng/mL). In the appropriate clinical setting, an elevated Troponin-I concentration and the presence of rising or falling levels with time are consistent with acute coronary syndrome.

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