Diagnosis of myocardial re-infarction

Biomarker least useful in diagnosis of myocardial re-infarction:

a) Troponin I
b) CPKMB
c) Myoglobin
d) CPK

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Prof. Dr. Johnson Francis, MD, DM, FACC, FRCP Edin, Senior Consultant Interventional Cardiologist | Former Professor of Cardiology, Calicut Govt. Medical College