The Troponin-I test is intended for diagnosis of Acute Myocardial Infarction (MI). As such, it is intended for use in the Emergency Room or inpatient setting. Any patient for whom this test is needed should be transported to the hospital.

Test Code

Alias/See Also
See Test code CARD - Cardiac Profile

CPT Codes

Troponin-I Quant and interpretation.

Transport Container
PST (plasma separator tube) for chemistry.

Reference Range
0.0 - 0.8 ng/mL

Clinical Significance

Troponin tests are primarily ordered for people who have chest pain to see if they have had a heart attack or other damage to their heart. Either a troponin I or a troponin T test can be performed; usually a laboratory will offer one test or the other. Troponins are sometimes ordered along with other cardiac biomarkers, such as CK–MB or myoglobin. However, troponins are the preferred tests for a suspected heart attack because they are more specific for heart injury than other tests (which may become positive in skeletal muscle injury) and remain elevated for a longer period of time.


The troponin test is used to help diagnose a heart attack, to detect and evaluate mild to severe heart injury, and to distinguish chest pain that may be due to other causes. In patients who experience heart-related chest pain, discomfort, or other symptoms and do not seek medical attention for a day or more, the troponin test will still be positive if the symptoms are due to heart damage.


The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.