Success rates


Of the total number of treatment cycles undertaken in Australian and New Zealand clinics in 2012, 13,312 resulted in the birth of at least one liveborn baby (Australian Institute of Health and Welfare).

It is important to remember that under natural circumstances (without assisted reproduction), the chance of any couple achieving pregnancy after trying for 1 month is only about 25%. However, if a couple who has no fertility problems keep on trying, the cumulative chance of pregnancy increases to about 85% after 12 months. Similarly, with IVF, the overall chance of achieving a pregnancy increases with the number of treatment cycles completed.

However, not all couples have an equal chance of achieving pregnancy. The most important factors currently known to influence success rates are as follows:

• The age of the female partner is the most important factor. The older the female partner the less the chances of success.

• Where the woman has been pregnant before, the chance of success is increased, particularly if the woman has conceived through assisted reproduction.

• The success rate is slightly lower if a couple has already been through a number of unsuccessful cycles.

• Lifestyle decisions such as smoking, drinking alcohol and obesity will all impact on your ability to become pregnant.


It’s important to note that unfortunately not every treatment cycle will result in an egg collection, an embryo transfer or having embryos to freeze.  

For further information on understanding success rates, please refer to the Fertility Society of Australia’s “Interpreting pregnancy rates: a consumer guide”. 




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Lifestyle changes

Attend a free information seminar
Westmead ButtonWestmead Doctor, IVF clinic
When: Wednesday 28 November 2018
Time: 6pm
Where: Westmead Hospital