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.
< 0.20 ng/mL
- TROPONIN-I, POC
- TROP POC
- POC TROP
Collect specimen in a green top tube.
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.