Introduction: The prevalence of obesity is continuously increasing among children with high risk for dyslipidemic troubles. Objective: The aim of the present study was to determine the prevalence of lipid abnormalities among children and adolescents in our geographic area and to evaluate IDF dyslipidemic criteria at increased risk of developing metabolic syndrome. Material and methods: 50 obese children aged 3-19 yrs (first group - 15 children, under 10 yrs and the second group - 35 children, above 10 yrs) and 50 normostenic children (age- and gender- matched controls) were evaluated. Blood samples for serum lipids were collected in all children. Total cholesterol, HDLcholesterol, triglycerides were measured and LDL cholesterol was calculated. This values were compared with the values above the 90 th percentile for gender and age (for total cholesterol, LDL-cholesterol, triglycerides), and also with the values under the 5 th percentile (for HDL cholesterol). In addition, the results obtained from the evaluation of second lot had been compared with the IDF criteria, using a single cut point for all pediatric age groups. The statistical program SPSS was used. Results: Total cholesterol, LDL-cholesterol, triglycerides and triglyceride/ HDL, LDL/HDL cholesterol ratio were significantly higher among the obese children, compared to control group. HDL cholesterol was significantly lower among the obese children. From the evaluation of obese children separately (first, second lot and globally) the following results are: hypertriglyceridemia - 33,3%, 22,85%, 26%: high LDL cholesterol - 13,3%, 22,85%, 20%; low HDL cholesterol - 6,6%, 2,85%, 4%. Working with the IDF criteria on the second lot, the following prevalences were revealed: for hypertriglyceridemia - 2,85%, for low HDL cholesterol - 31,42%. Conclusions: The disorder of the lipid profile is present in 44% of our obese children, reporting to the normal values for age and gender. Evaluation of the individual results leads to underdiagnostication of the dyslipidemia reporting to the IDF criteria. [ABSTRACT FROM AUTHOR]