Troponin is potentially more specific for myocardial damage than CK-MB and stays elevated longer. It may eventually replace CK-MB as the standard marker of myocardial damage. In addition, troponin T has been known to be elevated in the setting of even mild degrees of renal failure. Troponin and CK-MB both tend to rise approximately 3 hours after a MI (hence why the correct answer is "A", since it is false); however, troponins can stay elevated up to 2 weeks as CK-MB tends to return to baseline around 36 hours.
Chemistry
Which of the following statements is FALSE regarding troponin?
A . It rises much sooner after an MI than CK-MB
B. It stays positive much longer than CK-MB
C. It is potentially more specific than CK-MB
D. Troponin T is often elevated in renal failure patients
Answer: A
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