Published online by Cambridge University Press: 03 June 2019
Since the early days of in vitro fertilisation (IVF), the results of IVF treatment have much improved with a 32.8% live birth rate being reported for women aged under 35 years in the United Kingdom in the year 2012 [1]. The paradigm shift from natural unifollicular IVF treatment cycles to multifollicular stimulated IVF treatment cycles has been an important contributing factor to this improvement, largely enabled by the availability of ovulation induction drugs. It has led to the evolution of the concept of superovulation whereby the ovaries are stimulated to produce high numbers of good quality oocytes that will compensate in part for the deficiencies in IVF and cleavage, and facilitate a yield of good numbers of high quality embryos available for transfer, thereby increasing the probability of pregnancy. Ovarian stimulation is now an essential part of IVF with 98.3% of IVF in the United Kingdom being stimulated cycles in 2013 [1].
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