Several factors affect the chances of success, including the actual cause of infertility and the response of the patient providing eggs to the drug treatment, but their age at the time of egg collection is the most important factor affecting outcome. For women over 40, the chances of success are reduced. Even if the initial pregnancy test is positive, there is still a considerable risk of early miscarriage. There is usually a drop in pregnancy rate for women who commence treatment after the age of 35.
The treatment and success rates below have been sourced directly from the website of our regulator, the Human Fertilisation and Embryology Authority (HFEA). All the latest published success rates can be found on the HFEA website. Please note that information on success rates is of limited value in comparing licensed fertilities and choosing where to seek treatment.
Births per embryo transferred – excluding donor eggs and PGT-A
Data and charts below publish on the HFEA website for the period 01/01/2023 to 31/12/2023
All ages
Under 38 years of age
38 years of age and older
