Cardiac Markers

Cardiac markers
Marker	Initial Elevation	Peak Elevation	Return to Baseline
Myoglobin	1-4 h	6-7 h	18-24 h
CK-MB	4-12 h	10-24 h	48-72 h
Cardiac Trop I	3-12 h	10-24 h	3-10 d
Cardiac Trop T	3-12 h	12-48 h	5-14 d

The troponin I is the most sensitive cardiac marker, detectable in serum 3-6 hours after an MI, and its level remains elevated for 14 days.