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Background: Coronary artery disease is the most important cause of death in industrialized countries. Diabetes mellitus is one of the most important modifiable risk factors of coronary artery disease. It increases the risk of coronary artery disease by 2 to 4-fold. Interestingly, this increased risk is not confined to patients with DM, but non-diabetic patients with impaired glucose tolerance (IGT) also may have an increased incidence of cardiovascular complications. Moreover, increased admission glucose levels may be related to a higher mortality rates in patients with acute myocardial infarction (AMI), regardless of diabetic status. Objective: To assess the prognostic impact of admission HbA1c in patients without known diabetes mellitus who were admitted with acute ST elevation myocardial infarction, on outcome of 1ry PCI and short-term outcome of adverse cardiac events. Material and Methods: This is an observational, this study was conducted at Coronary care unit & coronary catheterization lab unit of cardiology department in Ain Shams University & specialized hospitals. The study period was 6 months (From 1-9-2018 till 1-3-2019). Results: 100 patients without prior diagnosis of DM were included in our study population Three categories of patients were created according to HbA1c level: Group 1 (< 5.7%): 46 patients (46%); Group 2 (5.5 to 6.4%): 38patients (38%); Group 3 (>6.5%): 16 patients (16%). Baseline characteristics of the study population are shown in Table 1. The mean age of our sample was 55.06 ± 11.73 years and 96% were males. There was highly statistically significant difference found between DM groups regarding SYNTAX score with P-value (0.002) & another highly significant difference in EF between the 3 groups. Conclusion: The present study showed that admission higher HbA1c level in non-diabetic patients presented by acute STEMI is associated with more severe CAD, lower rate of complete revascularization TIMI 3, and higher incidence of adverse cardiac events and mortality. Introducing measurement of HbA1c in the CCU seems to be a simple method to obtain important information on mortality risk. [ABSTRACT FROM AUTHOR]