Results: The population consists of two groups: group CKD stage 3 - 5 (n = 104), cTnI = 0.05±0.09ng / ml (0.00 - 0.79), 42.3% among this group have elevated cTnI and group without CKD (n=78), cTnI=0.01±0.01ng / ml (0.00 - 0.07) with only 7.7% have elevated cTnI.