Editing In vitro fertilisation (section)

====Live birth rate====
The live birth rate is the percentage of all IVF cycles that lead to a live birth. This rate does not include [[miscarriage]] or [[stillbirth]];  multiple-order births, such as twins and triplets, are counted as one pregnancy.

A 2021 summary compiled by the Society for Assisted Reproductive Technology (SART) which reports the average IVF success rates in the United States per age group using non-donor eggs compiled the following data:<ref>{{cite web |title=Final National Summary Report for 2021 |url=https://www.sartcorsonline.com/rptCSR_PublicMultYear.aspx?ClinicPKID=0#donor-fresh-egg |website=National Summary Report |access-date=28 April 2024}}</ref>

{| class="wikitable"
|-
! !! <&nbsp;35 !! 35–37 !! 38–40 !! 41–42 !! >&nbsp;42
|-
| Live birth rate (%)|| 54 || 40.5 || 26 || 13.3 || 4
|}

In 2006, Canadian clinics reported a live birth rate of 27%.<ref name=canadians/> Birth rates in younger patients were slightly higher, with a success rate of 35.3% for those 21 and younger, the youngest group evaluated. Success rates for older patients were also lower and decrease with age, with 37-year-olds at 27.4% and no live births for those older than 48, the oldest group evaluated.<ref name=r1>{{cite web|url=https://www.cdc.gov/art/ART2006/section1.htm|archive-url=https://web.archive.org/web/20090331150713/http://www.cdc.gov/art/ART2006/section1.htm|archive-date=31 March 2009|publisher=[[Centers for Disease Control and Prevention]]|title=2006 Assisted Reproductive Technology (ART) Report: Section 2|access-date=25 March 2009}}</ref> Some clinics exceeded these rates, but it is impossible to determine if that is due to superior technique or patient selection, since it is possible to artificially increase success rates by refusing to accept the most difficult patients or by steering them into [[oocyte]] donation cycles (which are compiled separately). Further, pregnancy rates can be increased by the placement of several embryos at the risk of increasing the chance for multiples.

Because not each IVF cycle that is started will lead to oocyte retrieval or embryo transfer, reports of live birth rates need to specify the denominator, namely IVF cycles started, IVF retrievals, or embryo transfers. The SART summarised 2008–9 success rates for US clinics for fresh embryo cycles that did not involve donor eggs and gave live birth rates by the age of the prospective mother, with a peak at 41.3% per cycle started and 47.3% per embryo transfer for patients under 35 years of age.

IVF attempts in multiple cycles result in increased cumulative live birth rates. Depending on the demographic group, one study reported 45% to 53% for three attempts, and 51% to 71% to 80% for six attempts.<ref>{{cite web | url = https://www.npr.org/templates/story/story.php?storyId=99654924 | title = Study: Sixth Time May Be Charm For In Vitro | vauthors = Neighmond P | work = Day to Day | publisher = National Public Radio | date = 21 January 2009 }}</ref>

According to the 2021 National Summary Report compiled by the Society for Assisted Reproductive Technology (SART), the mean number of embryos transfers for patients achieving live birth go as follows:<ref>{{cite web |title=Final National Summary Report for 2021 |url=https://www.sartcorsonline.com/rptCSR_PublicMultYear.aspx?ClinicPKID=0#donor-fresh-egg |website=National Summary Report |access-date=28 April 2024}}</ref>

{| class="wikitable"
|-
! !! <&nbsp;35 !! 35–37 !! 38–40 !! 41–42 !! >&nbsp;42
|-
| Mean # of transfers|| 1.33 || 1.28 || 1.19 || 1.11 || 1.10
|}

Effective from 15 February 2021 the majority of Australian IVF clinics publish their individual success rate online via YourIVFSuccess.com.au. This site also contains a predictor tool.<ref>{{Cite web|title=YourIVFSuccess|url=https://yourivfsuccess.com.au/|access-date=1 March 2021|website=YourIVFSuccess|language=en}}</ref>