Success rates and your stories

We want to help you conceive and have a healthy baby and we know one of the most important things you'll be looking at from a fertility clinic is their success rates and what other people's experiences have been. We're delighted to share our success rates and others' stories with you.

Click here to view a selection of our patient stories.

Our success rates

There are a number of ways to define your chance of a successful treatment outcome. Some websites present results that indicate your chance of achieving a positive pregnancy test or your chance of achieving a pregnancy that is confirmed at a 7 week scan (a clinical pregnancy). Although these results are important we at Cambridge IVF would like to present data on our live birth rates. This means the results we present are for patients that have delivered a baby. We have compared our data to the national average to give you a good idea of what is ‘normal’ in the UK and how we compare to other centres.

Measuring your chance of successful treatment

There are also a number of ways to measure your chance of successful treatment. We can assess the likelihood of each individual embryo leading to the birth of a baby (live births per embryo transferred) or how likely you are to take home a baby after your treatment cycle has started (live births per cycle started).

Many fertility experts feel that live births per embryo transferred is a more meaningful measure of your chance of taking home a baby than live births per cycle started because:

  • It takes into account how many embryos are being transferred during a patient’s treatment to achieve the live birth. Patients may have one, two or in rare circumstances three embryos transferred.
  • Live births per cycle started does not take into account that unfortunately some cycles are cancelled before the transfer can take place and therefore cancelled cycles have no chance of resulting in a baby. Cancellation of cycles is patient specific and depends largely on the diagnosis of the patients undergoing treatment.

Live birth rates per embryo transferred following fresh treatment (IVF/ICSI/IMSI)

These results show how likely it is that each embryo we transfer will lead to the birth of a baby.

The following data is from December 2011 to January 2016 and represents the percentage of babies born by female age following fresh embryo transfer from IVF, ICSI or IMSI at Cambridge IVF.  To allow for comparison we’ve compared these results to the national average for all fertility clinics in the UK.

Female age CIVF live birth rate (%) Number of live births National average live birth rate (%)
Under 35 25 25/100 27
35-37 31 28/90 22
38-39 14 9/63 15
40-42 5 6/127 8

Live birth rates per embryo transferred following frozen embryo transfer

It is incredibly important to take into account your chance of having a baby following a frozen embryo transfer. Today it is more common than ever to have one embryo transferred following fresh IVF or ICSI treatment. If you have additional good quality embryos we can freeze them for transfer at a later date. At Cambridge IVF we use a technique called vitrification to freeze embryos.  This technique has much higher success rates than the technique it replaced, calledslow freezing.  Wherever you have your treatment, we strongly advise you to choose a clinic with an effective freezing system and high frozen embryo transfer success rates as success rates for frozen transfer vary significantly from clinic to clinic.

It’s also important to be aware that research has shown that in certain patient groups cumulative pregnancy rates from two consecutive cycles of single embryo transfer are higher than rates achieved from transferring two embryos in one cycle.  This means that with an effective freezing programme, such as ours at Cambridge IVF, it is possible to achieve very good success rates safely, without putting patients at high risk of multiple pregnancy.  For more information please refer to the Human Fertilisation and Embryology Authority’s multiple births report (2015).

The following data is from May 2012 to January 2016 and represents the percentage of live births by female age following frozen embryo transfer at Cambridge IVF. These results show how likely it is that each frozen embryo we transfer will lead to a baby. To allow for comparison, we’ve compared these results to the national average for all fertility clinics in the UK. 

Female age CIVF live birth rate (%) Number of live births National average live birth rate (%)
Under 35 28 15/53 21
35-37 28 13/47 19
38-39 25 6/24 18
40-42 7 2/30 13

How many embryos should I have transferred?

The single biggest risk of fertility treatment is multiple pregnancy. At Cambridge IVF we aim to transfer embryos one at a time in all cases where the risk of a multiple pregnancy is high. By carefully considering this with the patients, we are able to keep our multiple pregnancy rates as low as possible without compromising the chances of success. The birth of a single, healthy baby is the safest outcome for everyone concerned. We are delighted that from April 2015 to March 2016 the multiple pregnancy rate at Cambridge IVF was 4.8% (2/42) compared to the national average of 14.4%.

Looking for more information?

We hope you have found this information useful. If you would like additional independent advice on success rates please visit the HFEA website. If you require more advice on our success rates please contact us for an informal discussion.