IVF success rates
If you are considering IVF treatment we understand that IVF success rates will be important to you. It is essential to understand what IVF statistics mean, so you can make the right decisions for your future.
- Understanding IVF success and statistics
What is an IVF treatment cycle?
A typical IVF treatment cycle involves the following steps:
- fertility drugs are injected to stimulate a woman's ovaries (ovarian hyperstimulation);
- eggs (also called "oocytes") are collected from the woman (sometimes referred to as "oocyte pick-up" or OPU), this is a day surgery procedure conducted under local or general anaesthetic;
- the eggs are then fertilised and matured. This may or may not involve other processes such as ICSI (intracytoplasmic sperm injection, a process in which a single sperm is injected into each egg to assist fertilisation using very fine micro-manipulation equipment) or Digital High Magnification sperm selection (which can assist men with DNA damage in their sperm);
- one or more embryos may be transferred to the woman's uterus (a "fresh embryo transfer"); and
- other embryos may be frozen and transferred later (a "frozen embryo transfer" or FET). An IVF treatment cycle is considered complete once all fresh and frozen embryos from the initial stimulated cycle have been used.
How do you measure IVF success?
Sometimes IVF success rates are quoted per complete IVF collection and treatment cycle. A full IVF collection and treatment cycle can involve multiple transfers of embryos collected from the one egg collection. Success rates measured this way will therefore naturally be higher than success rates measured per embryo transfer.
At IVFAustralia, we most often measure IVF success rates as clinical pregnancies (a pregnancy confirmed by a blood test and ultrasound scan, usually at around 6-8 weeks) per embryo transfer. Sadly, not every pregnancy will carry to a live birth, so we quote live births per embryo transfer as well as clinical pregnancies per transfer. We report our success rates per embryo transfer as we want to give you the most realistic understanding of your chance of success following each individual embryo transfer.
However it is important to understand that not every treatment cycle will result in an embryo transfer, for some women, no eggs will be collected, and, sometimes after eggs have been collected, there may be no transfer because embryos have not developed.
It is therefore important to understand what part of the IVF treatment cycle a particular statistic is measuring. Even after you check this, there are other factors that need to be understood before you attempt to compare IVF success rates. For example:
- the most important factor determining IVF success rates is a woman's age. When comparing IVF success rates, as well as checking what is being measured, check you are comparing rates for women of the same age. If 'whole of clinic' rates are quoted, consider whether the clinic might, overall, have older or younger clients than average - or do they perhaps send their more difficult cases to a different clinic altogether?
- Ask how often a clinic transfers more than one embryo with each transfer. More embryos per transfer may make success rates appear higher (this is a key reason some US rates appear higher than ours), but IVFAustralia rarely performs multiple transfers, as it can also increase the risks of multiple births, low birth weight and premature births.
- Check whether the data includes processes like ICSI, or includes frozen embryo transfers or only 'fresh'.
At IVF Australia we are proud of the success rates we are achieving for our patients. Together with our partner clinics in Melbourne, Queensland and Tasmania, we’re responsible for more births through IVF treatment than any other fertility group in Australia.
The following graph shows the proportion of IVF Australia patients who had a fresh embryo transfer of patients using their own eggs that resulted in a clinical pregnancy and a live birth in 2019. The success rates range from 38.8% per embryo transfer leading to a live birth for patients under 34 years, to 5.2% per embryo transfer leading to a live birth for patients over 43 years. It does not include any additional frozen embryo transfers that may have eventuated from that IVF treatment cycle.
The following graph shows the proportion of frozen embryo transfers using their own eggs that resulted in a clinical pregnancy and live birth in 2019. The success rates range from 33% per frozen embryo transfer leading to a live birth for patients under 34 years, to 18.4% per frozen embryo transfer leading to a live birth for patients over 43 years.
Want more information about IVF success rates?
Understanding IVF success rates can be complex. At IVF Australia we will always explain, as carefully as practical, how any data is calculated. Individual factors also affect every patient's prospects of success. The best way to understand the likelihood of success for you, and your partner, is to arrange a consultation with one of our fertility specialists. Our role is to give you a thorough understanding of your own personal situation, and to work with you to develop the most suitable treatment plan to give you, your best possible chance of taking home a baby.
For further information on interpreting success rates you can refer to the FSA guide “Interpreting Pregnancy Rates: a consumer guide”.