Natural cycle IVF: evaluation of 463 cycles and summary of the current literature.

Purpose: Natural cycle (NC) IVF/ICSI has proven to be an alternative to conventional IVF/ICSI cycles.

Methods: Within our retrospective, observational study (n = 159) infertile couples underwent (n = 463) cycles of NC-IVF/ICSI from May 2007 until December 2011. Oocyte pick-up was performed within a pure natural cycle excluding any hormonal stimulation except of hCG for ovulation induction.