Only women’s age and the duration of infertility are the prognostic factors for the success rate of natural cycle IVF

Purpose It is controversial who should be recommended to undergo natural cycle IVF (NC-IVF). Therefore, objective prognostic criteria which are already known at the time of counselling were defined. Methods A retrospective observational study was performed with 201 couples (age 34.7 ± 4.1) undergoing 311 NC-IVF treatments with 201 transfers, corresponding to a transfer rate of 65.3%. The first cycle resulting in a transfer of one embryo was further analysed. Clinical pregnancy and live birth rates were analysed. Results Pregnancy rate and live birth rates per first cycle were 21.9% and 13.2%, respectively. Groupwise comparison revealed the following clinical pregnancy/live birth rates per transfer cycle: duration of infertility 1–2 years 34.3/25.7%, 3–4 years 21.8/14.9% and > 4 years 9.1/4.5%. Women’s age