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. 2018 Oct 17;9:589. doi: 10.3389/fendo.2018.00589

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Copyright © 2018 Alviggi, Conforti, Esteves, Vallone, Venturella, Staiano, Castaldo, Andersen and De Placido.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Ovarian sensitivity using the Follicle-to-Oocyte Index (FOI). Case number 1 depicts a patient with normal FOI, in whom the number of oocytes retrieved was consistent with the AFC at the start of stimulation. Case number 2 illustrates a patient with suboptimal number of oocytes retrieved (between 4 and 9), but with a normal Follicle-to-Oocyte index (FOI >50%). Case number 3 shows a patient with both hypo-response and suboptimal oocyte number. This patient had only 7 oocytes collected despite an AFC of 15 at the beginning of stimulation (FOI ≤ 50%). Case number 4 depicts a patient with both hypo-response and poor response.