Objective.

To analyze the relationship between the Body Mass Index in women and the results obtained in assisted reproductive techniques.

Methods.

A non-experimental, cross-sectional, descriptive and correlational design was carried out through an analysis of secondary data in several assisted reproduction clinics from Spain. 3,273 medical records of women undergoing In Vitro Fertilization between 2015 and 2018 were analyzed. Data on affiliation and treatment initiation, anthropometric data, personal history, current diseases, primary and secondary infertility, as well as the reference parameters to the results after the assisted reproduction treatment were collected. The statistical analysis was performed using SPSS v19.0 software.

Results.

A total of 798 women (24.42%) had a BMI values ≥ 25. The overweight women achieved a lower number of oocytes retrieved and fertilized, as well as fewer embryos obtained. The women with normal weight achieved a lower number of mature oocytes and those with low weight had a lower fertilization rate.

Conclusions.

It has been found that the results obtained in assisted reproductive techniques are related to women's Body Mass Index.

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