Inadvertent recombinant human follicle stimulating hormone bolus instead of human chorionic gonadotrophin leads to the retrieval of competent oocytes in IVF program.

Objective: To present a case where recombinant human FSH (r-hFSH) was accidentally used instead of hCG and resulted in oocyte maturation.

Design: Case report.

Setting: A tertiary infertility center.

What criteria for the definition of oocyte quality?

Although the spermatozoon provides an essential contribution to the generation of a new individual, the developmental fate of the embryo is principally dictated by the oocyte. Oocyte competencies are acquired throughout oogenesis, via the interaction with somatic cells. The ability to reinitiate the meiotic process and undergo preimplantation development is progressively determined during the antral phase.