0486 Body composition (BC) assessment has a key relevance in designing and monitoring physical activity as well as nutritional programs. Increasing attention has focused on the association between body fat (BF) and related metabolic risk factors. As shown in previous studies, the accuracy of BF prediction by BIA and skinfold thickness methods (SKF) can be affected by ethnicity. PURPOSE: To compare the leg-to-leg BIA system, as a reference method, with three SKF methods for the assessment of BC in young Hispanic women. METHODS: Reliability study in 74 Hispanic, young (19.3 ± 0.83 yrs) 3rd year, volunteer, medical students. BF was first measured using two, three and rd six site SKF according to the equations provided by Katch-McArdle, Jackson-Pollock and Yuhasz. Then, BF was determined with a foot-to-foot impedance apparatus (Tanita body fat analyzer Model 2001 T) using a previously validated 50-kHz BIA analysis equation, under standardized ambient and subject conditions. Fat free mass (FFM) and fat-to-fat-free mass ratio (FFMR) were calculated for each method as well as BMI and WHR determination. Analysis of variance, intraclass correlation coefficient (ICC), and Bland-Altman plot analysis were used for the comparative analysis between the methods. RESULTS: Mean BMI and WHR were 22.15 ± 2.93 kg·m-2 and 0.79 ± 0.05 respectively. 18.9% of the subjects were overweighed while 6.8% had a WHR > 0.90. BF measurements obtained by the Yuhasz, Katch-McArdle and Jackson-Pollock SKF were 12.85 ± 4.58 kg; 12.88 ± 4.59 kg and 13.28 ± 4.87 kg. BF predicted by BIA was significantly higher (16.06 ± 6.11 kg) (P<0.001). The strongest ICC coefficient between BIA and SKF predicted FFMR was found for the Katch-McArdle method (r = 0.81 95% CI 0.69; 0.87), followed by the Yuhasz (r = 0.80 95% CI 0.69; 0.87) and the Jackson-Pollock method (r = 0.78 95% CI 0.66; 0.86). SKF methods showed consistently lower BF values (20%) than BIA. CONCLUSION: In our study, the tree SKF methods showed similar BF prediction values compared with the BIA system. For all SKF methods BF values were 20% lower than the BIA prediction. 2-site skinfold formula appears to be more consistent when assessing BC in Hispanic/latino populations. Whether this difference is due to ethnic specific validity of each method can not be concluded with the present study.