This study aimed to assess the prevalence of prediabetes using impaired fasting glucose (IFG) in secondary school students aged 10 to 19 years in Port Harcourt, Nigeria, and to determine associated risk factors. Fasting blood glucose (FBG), blood pressure (BP), and body mass index (BMI) was measured. All students who had a FBG of 5.6 - 6.9mmol/l were asked to undergo an oral glucose tolerance test (OGTT). A total of 880 students were studied. The prevalence of IFG using the International Society for Paediatric and Adolescent Diabetes (ISPAD) criteria was 17% and prevalence was comparatively higher in subjects who were obese, had systolic prehypertension or diastolic hypertension, as well as a family history of diabetes. There was, however, no statistical association between the BMI percentile categories, BP category, sex and age category, or family history of diabetes and occurrence of IFG. The prevalence of IFG was 4% using the World Health Organization (WHO) criteria. Only one child had diabetes. Sixty-six (42%) students who had IFG had an OGTT, of which 10(15%) had IGT. We conclude that prediabetes is common in this population, and screening should be considered, at least in those with obesity or a family history in diabetes.

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