ABSTRACT Background_ Age, creatinine and ejection fraction (ACEF) score has been established as a predictor of clinical outcomes in patients undergoing primary Percutaneous Coronary Intervention. Its utility in patients undergoing elective percutaneous coronary intervention is yet unexplored. AIM OF WORK__This study aims to investigate the risk factors associated with Acute Kidney Injury development in patients with ST segment Elevation undergoing primary PCI or with Coronary Artery Disease undergoing elective PCI.We investigates the applicability of ACEF score on patients undergoing elective PCI Patients and Methods__ calculating ACEF score for 80 patients divided into two groups: group I will include 40 patients for primary PCI and group II will include 40 patients for elective PCI with fixation of type (meglumine- ioxitalamate) and amount (≤300 ml) of the contrast used . Results__ 8 patients from 80 had AKI; 4 patients from each group .There was no significant difference between both groups regarding smoking, history of diabetes mellitus, hypertension, dyslipidemia and family history of IHD in primary PCI group versus elective PCI group. Conclusion__ A fully pre-procedural risk prediction model would be useful to facilitate precautionary measures for patients at a high risk of Contrast Induced Nephropathy.  ACEF risk score incorporate only 3 variables, which may make it more acceptable for clinical use, because of its simplicity.ACEF score can be used to predict AKI in patients undergoing primary PCI as well as elective PCI.