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Troponin test. A troponin test measures the levels troponin T or troponin I proteins in the blood. These proteins are released when the heart muscle has been damaged, such as occurs with a heart attack. The more damage there is to the heart, the greater the amount of troponin T and I there will be in the blood. How the Test is Performed.
Normal troponin levels 12 hours after chest pain has started mean a heart attack is unlikely. The examples above are common measurements for results of these tests.Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples.ost patients who have had a heart attack have increased troponin levels within 6 hours. After 12 hours almost everyone who has had a heart attack will have raised levels. Troponin levels may remain high for 1 to 2 weeks after a heart attack. Increased troponin levels may also be due to: 1  Abnormally fast heart beat.