Every fertility journey is different, so it helps to understand what New Zealand IVF success rates really mean.
The most meaningful outcome to look for is the chance of having a baby (a live birth), rather than a positive pregnancy test.
In New Zealand, we use ANZARD data (Australia and New Zealand Assisted Reproduction Database) to measure the most current IVF results, based on all fertility clinics in New Zealand and Australia. Last updated in September 2025, the ANZARD 2023 data tells us:
These figures are provided as a general guide and reflect large-scale Australasian data. Your own chance of success may be higher or lower depending on your medical history and fertility factors.
If you’d like help interpreting the numbers, the Repromed New Zealand team can talk you through what success rates mean for your age group and situation.
As we age, the quality of our gametes (eggs and sperm) decline with time.
At birth, females have a defined number of the eggs for the entire life of their reproductive life. This means that when someone is ovulating an egg, or having IVF in their 30s, the egg that is released or retrieved has been waiting dormant in their ovary.
This is why the older our eggs are, the more likely they will have been subjected to environmental and aging factors that reduce their quality and genetic normality. The graph below demonstrates how the abnormality rate of our eggs increases with age, and how this is directly related to a decline in the chance of having a live birth.
Data source: ANZARD 2023, published in September 2025
| Age group | Embryos with abnormal chromosomes (approx.) | Live birth rate (approx.) |
|---|---|---|
| Younger than 35 years | 29% | 29% |
| 35 to 37 years | 42% | 27% |
| 38 to 40 years | 43% | 21% |
| 41 to 42 years | 77% | 11% |
| Over 42 years | 85% | 2.5% |
Your ovarian reserve levels can be tested via a simple blood test. Read more about how to test your egg reserve levels (also known as AMH or the female fertility test).
We now know that age also impacts sperm quality. Research has shown that DNA fragmentation within sperm is increased in men over 40 and has been significantly linked to an increase in miscarriage rates.
One study has demonstrated a 4% decrease in odds of having a live birth in people undergoing IVF for every additional year of the male’s age.
It is simple to test sperm health by doing a sperm test (also known as the male fertility test).
Find out more about understanding sperm health here.
In vitro fertilisation (IVF) statistics are internationally reported in age brackets of females undergoing treatment. The ANZARD data from 2023, published in September 2025 shows us that the under 35 age group has the highest chance of a birth with around 38% of women having a baby from a single fresh or frozen embryo transfer in an IVF cycle.
The most common age group who seek IVF treatment, the 35 to 39 year olds, have a 26.6% rate of having a baby with a fresh single embryo transferred. This increases to 33.4% when a frozen single embryo is transferred in an IVF cycle.
Importantly, live birth rates in females 40 years and older, decline to 8.7% per fresh single embryo transfer, and 22.5% live birth rate with frozen single embryo transfer in an IVF cycle.
See this summary from the 2023 report from Australia and New Zealand Assisted Reproduction Database (ANZARD), published in September 2025:
| Age group | Live birth rate for fresh transfer | Live birth rate for frozen transfer |
|---|---|---|
| Younger than 35 years old | 38.3% | 38.1% |
| 35 to 39 years old | 26.6% | 33.4% |
| Over 40 years old | 8.7% | 22.5% |
| Average for all ages | 25.3% | 32.8% |
Data source: ANZARD 2023, published September 2025. Represents IVF/ICSI cycles per single embryo transfer. Excludes donor eggs. Results vary by individual circumstances.
The live birth data above are drawn from the most recent Australasian and New Zealand Assisted Reproductive Technology (ANZARD) report 2023, last updated in September 2025, which includes outcomes from IVF and ICSI treatment cycles using a patient’s own eggs across Australia and New Zealand.
Success rates are shown per single embryo transfer and are separated by age group and by fresh versus frozen embryo transfers.
Individual results will vary depending on factors such as age, cause of infertility, reproductive history, and overall health.
Not every treatment cycle results in an egg collection, embryo transfer, or embryo freezing.
For the most recent published data, see the ANZARD 2023 Report, published September 2025.
There is a great deal that you can control regarding your lifestyle to better improve your chances. Read more about maximising your chance of conceiving.
Fertility clinics in New Zealand are all operating to the highest industry standards, so your choice of clinic will ultimately depend on the best fit and feel for you. Speak with your fertility doctor about your personal chances of success and taking home a healthy baby.
The Australian Government has a website called Your IVF Success that provides independent and impartial information for those considering starting or continuing IVF. Although an Australian site, it may be helpful for Repromed Auckland clients to use the calculator in order to make informed decisions about IVF treatment, with the support of your Repromed fertility doctor.
Click here to use the Your IVF Success Estimator.
Please note that the advice and information is not associated with Repromed New Zealand, please discuss any queries with your Repromed doctor.
We’re happy to talk you through what the numbers mean and what treatment options may give you the best chance of success. You can read our helpful article A beginners guide to IVF for more information.
Please contact our team if you would like to book an appointment to discuss your personal situation. Or for new clients, we offer a free 15 minute phone consultation with a fertility doctor – book your free appointment here.
The pregnancy rate is interesting but not a recommended outcome as it can be easily misleading for people who want a live healthy baby.
A live birth is the most meaningful measure of success because not all clinical pregnancies (heartbeat seen at seven weeks) will result in the birth of a baby due to miscarriages. Measuring the live birth rate reflects the chance of achieving a birth, rather than an early pregnancy result.
Age affects:
This is why IVF success rates are typically reported by age group, and why people under 35 generally have higher success rates.
The number of embryos transferred can influence the results, as the more embryos are transferred, the greater the chance of pregnancy and twins. The standard practice in most clinics in Australia and New Zealand is to transfer only one embryo to minimise a multiple pregnancy. This is because multiple pregnancies affect the health and safety of the client and baby.
“Per cycle started” includes everyone who begins an IVF/ICSI cycle, even if the cycle is cancelled before egg collection or embryo transfer.
This measure is useful because it reflects real-world outcomes and gives a more complete picture than results based only on embryo transfers.
“Per embryo transfer” success rates only include cycles that reach the embryo transfer stage.
Because not every cycle progresses to transfer, this number is usually higher than “per cycle started”.
This can happen for a range of reasons, including:
While it can feel disappointing, the decision to delay transfer is sometimes the safest and most effective approach.
In many cases, frozen embryo transfers can have similar or even higher success rates than fresh embryo transfers.
That’s because the body may be more ready for implantation when embryos are transferred in a later cycle, when hormone levels have returned to baseline. But it can also be a consequence of the fact that only high-quality embryos can be frozen, which translates into higher rates of pregnancy when a thawed embryo is transferred.
ANZARD stands for the Australia and New Zealand Assisted Reproduction Database.
It is the main official database that collects IVF outcomes across Australia and New Zealand and allows clinics to benchmark results against large-scale, standardised data. Using ANZARD helps ensure success rate reporting is transparent and consistent. Find out more here: ANZARD report 2023, last updated September 2025.
Cumulative live birth rate looks at the chance of having a baby over multiple embryo transfers, including transfers from fresh and frozen embryos created in a single egg collection cycle.
This can be a useful way to understand the overall chance of success, because it reflects the fact that many people may need more than one embryo transfer from one IVF cycle to maximise their reproductive potential. At Repromed NZ, we encourage clients to consider and financially plan for their treatment to require two cycles of IVF as a minimum, especially if their ideal family size is two or more children.
IVF and ICSI are both proven fertility treatments.
ICSI is often used when there are male-factor fertility concerns, or when we want to maximise fertilisation rates in certain situations. So NZ ICSI success rates depend less on whether IVF or ICSI is used, and more on factors such as age, egg quality, embryo development, and underlying fertility diagnosis.
Other factors that can impact outcomes include:
Your specialist can help you understand which factors are most relevant in your case.
All clinics in New Zealand and Australia are required to report their live birth success rates to authorities (ANZARD) that analyse and publish the results so that clinics can benchmark themselves against acceptable clinical standards. The results for Repromed are assessed by our external auditors on behalf of the RTAC (Reproductive Technologies Accreditation Committee) and the New Zealand Health and Disability Standard Ngā Paerewa NZ8134.
Additionally, clinics such as Repromed Auckland who provide publicly funded treatment, are also performance monitored six monthly by their Regional Health Authority. The endorsement of these authorities provide an assurance to patients that they are receiving the highest level of quality of care and outcomes.
Yes. The best way to understand your likelihood of success is through a consultation, where your specialist can consider your individual factors such as:
We’ll explain the statistics clearly and help you make a plan that feels right for you.
Please contact our team if you would like to book an appointment to discuss your personal situation.
Medical information disclaimer
This page provides general information only and does not replace personalised advice.
Please contact our team if you would like to book an appointment to discuss your personal situation. Or for new clients, we offer a free 15 minute phone consultation with a fertility doctor – book your free appointment here.
DipNurs
Megan leads the nursing team through the continually changing face of IVF. She works in a multidisciplinary team, providing the essential organization between the doctors and laboratory and ensuring communication between all departments.
Megan started her IVF nursing career in the United Kingdom, working in two large London clinic’s before returning to New Zealand. She is also the Secretary of Fertility Nurses of Australasia.
I love working with people and see nursing as a vocation, not a job. I usually spend my downtime absorbed in a good book and planning my next travel adventure.