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pregnancy loss. BMI only differed from %BF in PPV of LGA infants (>4000g) where BMI was 12.7% and %BF was 9.35%.CONCLUSIONS: To our knowledge, this is the first study to prospectively follow infertile patients and compare BMI to %BF in their predictive values on pregnancy outcomes. No differences were noted in the PPVof BMI versus %BF with regard to miscarriage rates or preterm delivery. BMI had a higher PPV than %BF in predicting LGA infants. Given that measurement of %BF through BIA has been previously validated in other fields of medicine, our findings suggest that BMI measures up to %BF as a successful approximation of patients' adiposity, and can be confidently used for counseling at-risk obese patients undergoing IVF.SUPPORT: None.