The aim of this study was to evaluate the diagnostic accuracy of ischemia modified albumin (IMA) alone, or in combination with cardiac troponin T (cTnT) and electrocardiogram (ECG) findings for diagnosis of acute coronary syndrome (ACS). The study included patients with acute chest pain suggestive on ACS, recruited within 6 hours from onset. Patients were classified in ACS group and non-ischemic chest pain group (NICP). Of 84 patients, 49 were diagnosed with ACS and 35 with NICP. IMA was significantly higher in ACS group (p<0.0001). The area under receiver operating curve for IMA in ACS diagnosis was 0.95 (p<0.0001). Sensitivity and specificity of IMA for ACS diagnosis were 89.8% and 91.4%, respectively. IMA significantly (p<0.05) improved the sensitivity of ECG and cTnT, alone, and in combination. Sensitivity and negative predictive value of combination of IMA, ECG and cTnT for diagnosis of ACS were 100%. IMA is useful for diagnosis of ACS, in combination with ECG and cTnT.