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Fertility Treatment Success Rates

All couples with fertility problems want to be treated in a clinic that has the highest possible success rates. At Fertility PLUS we are proud that we have been consistently in the top quartile of clinics for IVF pregnancy rates in Australia and New Zealand.

Importantly, for each individual couple their underlying fertility problem and age may have far more impact on their chances of success than treatment outcomes for a clinic as a whole.

Understanding pregnancy rates

Pregnancy rates can be expressed in a variety of ways which can make comparing results between clinics difficult and can also provide overly optimistic or pessimistic information for couples depending on where they are in their treatment experience.

Typical ways of expressing pregnancy rate include:

Live birth rate per treatment cycle started

This gives the lowest success rate as it includes cycles where women over or under responded to stimulation drugs so did not proceed to egg collection, where no eggs were collected, or no eggs fertilised, or where the embryos were frozen without a fresh embryo transfer in order to avoid OHSS.

Clinical pregnancy rate per embryo transfer

This does not take into account women who miscarry or the pregnancies that result from the use of any frozen embryos.

Cumulative live birth rate per fresh embryo transfer and any subsequent frozen embryo transfers

This includes all babies born from a single egg collection, after either a fresh or frozen embryo transfer. This gives the chance of a live birth from an egg collection after having a fresh transfer and/or thawed embryo transfers.

This method of showing success rates is the most useful for couples about to embark on their first cycle of publicly funded IVF. It takes account of the fact that some couples who do not conceive on a fresh embryo transfer from their IVF cycle may have a successful pregnancy following a frozen embryo transfer. About 45% of couples have embryos frozen. Fertility PLUS has maintained a high pregnancy rate from thawed embryo cycles for many years.

Couples having publicly funded treatment must thaw their frozen embryos before having a second publicly funded cycle. If they conceive from the first IVF cycle, the public funding still covers the thawing and replacement of any remaining frozen embryos up until there are two children born to the relationship.

IVF pregnancy rates

The specialist at Fertility PLUS can give you statistics for your chance of a live birth based on your age, cause and duration of infertility.

The most important factor affecting success rates is female age. Couples embarking on an IVF treatment cycle can expect that:
  • Under 35 nearly half will have a baby
  • At 37 years of age a third will have a baby
  • At 39 a quarter will have a baby
  • At 40 a fifth will have a baby
  • At 42 one in 10 will have a baby

Donor Insemination pregnancy rates

The most important factor affecting success rates for donor insemination (DI) is female age. With successive cycles an increasing proportion of women receiving DI treatment will conceive. The pregnancy rate for women under 40 years of age having DI at Fertility PLUS is approximately 20% per insemination. This is based on the last 9 years results.

Intra-uterine Insemination success rates

Success rates for individual couple vary significantly with female age. For women under 40 years of age having Intrauterine insemination (IUI) at Fertility PLUS, the clinical pregnancy rate over the last 9 years is approximately 15% per insemination. As with DI, women having successive cycles of IUI will increase their chances of conceiving.

How likely am I to become pregnant?

Once we have reviewed your medical history and test results we can discuss with you what your chances of becoming pregnant thought fertility treatment are. Many couples find it difficult to make sense of reported success for different treatments and clinics. Please feel free to ask us if you feel that you need more information.
National Women's Health
Phone: 09 307 4949
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