The way IVF success rates are calculated may vary from clinic to clinic. Calculating and presenting success rates by clinics is a common "communication" issue as clinics try to advertise the best values on their websites.
IVF success rates are usually calculated as a percentage of clinical pregnancies dividing the number of favorable results such as number clinical pregnancies by the number of procedures performed such as a number of embryo transfers, according to the following formula:
"number of pregnancies or number of live births / number of embryo transfers"
You should be aware that the success of IVF treatment is the sum of different factors and circumstances, only few of which depend on the clinic itself. The latter are surely the experience and professionalism of the medical staff as well as offered IVF treatments that allow particular types of patients (with either lower or higher chances of a successful pregnancy).
However, in majority of cases it is your individual situation, condition and medical history that influence the result of the treatment. Your age, genetic factors or various reasons for infertility play a crucial role in determining the IVF success.
Contact in person the clinics you’re interested in and discuss your own perspectives on IVF success instead of studying success rates advertised on clinic's websites.
If you'd like to now more about egg donation success rates please refer to this article:Donor egg IVF success rates – the truth clinics don’t tell you
If you'd like to know more about IVF with own eggs success rates please refer to this article:IVF Success Rates – myths & figures revealed