2-hour test time is too long for using this test in community and needs to be improved Objective: To define the prevalence of pre-diabetes by using OGTT and to evaluate the probability of shortening test time. Method: Cross-sectional study on 98 students practicing at Department of Physiology in the University of Medicine and Pharmacy at HCMC Results: The prevalence of impaired glucose tolerance (pre-diabetes) by using OGTT was 26.5%.