The purpose of this study is to compare Korean adolescents' fasting blood sugar(FBS), hemoglobin A1c(HbA1c) and serum ferritin according to their body mass index(BMI). This study conducted a secondary analysis using a raw data of The Fifth Korea National Health and Nutrition Examination Survey (KNHANES V-3), 2015 which researched by Korea Centers for Disease Control and Prevention. Then this study classified adolescents(13-18y) in obese group(?25.0kg/m�) 63people (21.1%) and normal group(18.5?22.9kg/m�) 236people(78.9%), then analyzed survey and blood test of total of 299 people. Data were analyzed using descriptive statistics, Chi-square test, t-test and Pearson correlation coefficient (SPSS 24.0). The major findings of this study were as follows. Frist, male(65.1%) appeared to be more in obese group than female(34.9%). Second, obese group(5.48%) showed higher rate of HbA1c than normal group(5.40%) also obese group(52.06?U/L) showed higher rate of serum ferritin than normal group(39.43?U/L). Third, BMI has statically significant correlation between FBS, HbA1c and serum ferritin. We want to provide a basis data for the prevention of obesity intervention program for adolescents.

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