CARDIAC ENZYMES

Cardiac Enzyme	Normal value	Elevation level (Released in the bloodstream)	Peak level
CK-MB (creatine kinase, myocardiac muscle	26-174 Units/L	Occurs within 4-6 hours (elevation indicates myocardial damage)	18-24 hours
Lactate Dehydrogenase (LDH) Normally LDH1 (bad) is lower than LDH 2 (good); when LDH1 (bad)   is higher than LDH 2 (good) = myocardial necrosis	140-190 U/L	Occurs within 24 hours	48-72 hours
TROPONIN – has three proteins Troponin C Troponin I Lower than 0.6 ng/ml Rises within 3 hrs and persists up to 7 days Troponin T (“earlier”, preferred marker  for cardiac damage than CK) 0-0.2 2-6 hours 12-26 hours
Myoglobin - oxygen binding protein found in cardiac and skeletal muscle		The level rises within 1 hour after cell death	4-6 hours (returns to normal within 24-36 hours)