Background Prediabetes is an intermediate stage prior to development of diabetes mellitus. Preimpaired glucose tolerance state represents an early stage in the pathogenesis of diabetes wherein the normal glucose is attained by compensated hyperinsulinemia. Glycosylated hemoglobin is used in diagnosis and monitoring of diabetes but has not been explored in pre-IGT state. The objective of this study is to compare the 2-hour blood glucose, 2-hour insulin level, and HbA1c between normoinsulinemic-normal OGTT and pre-IGT groups. Methods Conducted at University of Santo Tomas Hospital, this was a retrospective analytical study of Correlation of Glycosylated Hemoglobin And Oral Glucose Tolerance Test Results levels. This suggests that indeed the metabolic abnormality must be addressed as early as the pre-IGT stage.