Days Set Up
Daily, 24 hours
Analytic Time

2 hours

MiChart Code
Troponin I
Soft Order Code

Test Updated:



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Test Overview

Test Methodology

Immunometric Chemiluminescence

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 6 hours after an acute myocardial infarction, with peak concentrations being reached in approximately 12-18 hours after infarction. Unlike other cardiac markers (CKMB, Myoglobin), Troponin I levels remain elevated in plasma for several days before returning to normal. Troponin I may be elevated in a number of cardiac conditions other than AMI, including unstable angina.

Reference Range

< 0.30 ng/mL

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

Specimen Requirements

Collection Onsite

Collect specimen in a green top tube.

Collection Offsite

Collect specimen in a green top tube. Centrifuge, aliquot plasma into a plastic vial and refrigerate.

Normal Volume
0.5 mL plasma
Minimum Volume
0.25 mL plasma

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.