1 The disparity between the two figures is due to miscarriage or stillbirth. In 2017, 22.9% of initiated cycles resulted in a clinical pregnancy* and 18.1% in a live birth. So this figure includes cycles that were started, but were subsequently cancelled, or where there were no eggs to collect or no suitable embryo to transfer. The number of live births/pregnancies per treatment cycles commenced describes the number of pregnancies and live births achieved for women that started an IVF cycle (with the intention of a pregnancy, not just to freeze eggs), regardless of whether or not they progressed to subsequent steps of the cycle. The IVF treatment cycle ends when a fertilised egg (now called an embryo) is transferred back into your womb in the hope that it will successfully implant in the wall of the uterus, thereby establishing a pregnancy. Live births/pregnancies per treatment cycles commencedĪn IVF treatment cycle starts with hormonal stimulation – when you start taking medicine after your period to encourage your ovaries to produce lots of eggs. Before reading the rest of this article, you may find it helpful to refamiliarise yourself with the different steps that make up an IVF treatment cycle. This article provides an overview of the different figures you might see and what they mean. For example, you might wonder what the difference is between a ‘clinical pregnancy rate’ and a ‘cumulative pregnancy rate’, or why there are generally more births per ‘egg collection’ than there are per ‘embryo transfer’. Instead, there are several different figures that clinics may use to report their success rates and the different terms can be confusing. IVF success rates are not represented as a single percentage probability. 1 In 2017, the average age of women undergoing IVF and using their own eggs was 35.7 years while the average age of women undergoing IVF using donor eggs or embryos was 40.3 years. For example, for women aged younger than 30 years, the live birth rate per fresh embryo transfer (using the woman’s own embryos) was 38.5% in 2017 but this figure dropped to 23.7% for women aged 35–39 and 8.9% for women aged 40–44. This means that when you are reviewing IVF success rates – at either a clinic or population level – you should look at data specific to your age group. However, the likelihood of success is different for everyone and is particularly influenced by the age of the woman. We feel that by giving our level of detail, rather than using the HFEA’s more limited age ranges of only below and above 38, we can more fairly inform, particularly in the older age brackets where many clinics may be more reluctant to treat.In 2017, the number of IVF births in Australia and New Zealand was the highest in IVF’s 40-year history – for every 100 treatment cycles started, 18 babies were born. There is no national direct comparison for “Births per collection”. It is important to note that once a livebirth is achieved, further births are not added to the data. This gives an overall picture of success rates for a full course of treatment by detailing what proportion of women undertaking an egg collection subsequently achieve a birth. With the improved frozen embryo success rates, an increasing number of cycles lead to embryos being frozen without a transfer on medical grounds.Ī further useful assessment of outcomes is therefore “Birth per collection” (also known as cumulative livebirth) which shows the chance of success from the fresh and frozen embryo transfers for at least two years following a single stimulation cycle and egg collection. Our results can be analysed in more detail and personalized by using our Pregnancy Calculator, based on data collected at the Lister Fertility Clinic over a 5 year period Also it is a fairer assessment of outcome as the unnecessary transfer of multiple embryos against national guidelines and despite the risks involved, which does still occur can artificially inflate success rates. The HFEA now recommends clinic success rates be predominantly presented as livebirth per embryo transferred (PET) as it promotes embryo transfer practices that minimises the chances of twins, which carry health risks for the babies and the mother. This ethos and our continued success into 2021 has seen us proudly pass the 20,000 mark for babies born from treatments under our dedicated team. In contrast, at the Lister the average is 37.5 with 34% under 37. This can be illustrated by the fact that at the Lister Fertility Clinic from 2014-2019 40% of our cycles are performed on either those who meet the Bologna criteria for “poor responders" or have had multiple previous cycles.Īlso the average of patients having IVF in the UK is 35.5 with 65% under 37 (Fertility Trends 2017: HFEA). The results below are based on the Lister Fertility Clinic ethos of not specifically selecting the patients we treat.
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