Probably one of the most confusing and difficult things within infertility is understanding infertility success rates. For many people considering infertility treatments, a clinic’s fertility success rates may play a large role in why they choose one clinic over another. This makes understanding the statistics and how the information is gathered and calculated very important.
How Many IVF Cycles Does the Clinic Perform Per Year?
It is important to choose a clinic that is proficient at performing IVF. Two per week, or 120 a year is a good average and reflects that they have developed a trusted reputation within the IV community.
What is the Clinic’s Clinical Pregnancy Rate per Cycle Initiated?
This number is calculated by the number of clinical pregnancies divided by the total number of those who initiated treatment.
What is the Clinical Pregnancy Rate Per Retrieval?
This statistic is calculated by taking the number of clinical pregnancies and divide them by the number of egg retrievals.
What is the Clinical Pregnancy Rate Per Transfer?
This number is arrived at by taking the total number of clinical pregnancies divided by the number of women who had an embryo transfer.
What is the Success Rate per Age Group
The success rate per age group can tell you some significant things about a clinic. The numbers will be highest in the under age 35 population. Higher numbers in groups older than 35 may indicate a more aggressive treatment philosophy.
What is the Average Number of Embryos Transferred?
One technique in assisted reproductive technology is to transfer more than one embryo to increase the likelihood of success. However, it also increases the number of multiple births, which clinically speaking, is not considered successful.
Considerations About Success Rates
When weight the information provided by success rates, it is important to consider the real relevance. All statistics are based on data gained from a collective population. However a patient is not a population and has a unique medical profile.
Another concern is that statistics can be manipulated and there is no way to know what the data truly reflects. For example, one clinic may transfer a high number of embryos at one time, resulting in a higher number of live births. One clinic may treat more women over age 35 while another concentrates on the groups with the highest chances of achieving pregnancy.
The Center for Disease Control and Society of Assisted reproductive Technology which publish clinic success rates does so with the disclaimer that success rates “may not contain all of the information that a woman or couple needs to decide which ART clinic or procedure is best for their treatment.”
While it is important to know the stats, it is equally important not to base a decision solely on the individual success rates.

