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Success rates


Our Assisted Conception Unit (ACU) is proud of our history of offering both IVF and PGD. Over 1,000 babies have been born following PGD at Guy’s Hospital.

Success rates are published by the Human Fertilisation and Embryology Authority (HFEA). Overall, around one in three (33%) PGD cycles will result in a pregnancy which progresses to term. If there are healthy embryos created, this rises to one in two (50%) per embryo transferred. In other words, each embryo has a one in two (50%) chance of resulting in a pregnancy.

More detail about our success at each step of the PGD process is below.

PGD success rates 1997-Dec 2019
 Overall (1997-2019)20152016201720182019

Number of cycles

3,828 396 423 435 436 483

Number of embryo transfers 

2,538 241 283 262 243 281

Clinical pregnancies*

1,112 124 111 129 124 147

Clinical pregnancy rate per cycle of PGD (%)

29% 33.5% 29% 29.5% 28.5% 30.4%

Clinical pregnancy rate per embryo transfer (%)

44% 40% 46% 49% 51% 52.3%

*Clinical pregnancy rate is defined as a pregnancy which has been confirmed to have a fetal heartbeat on an ultrasound scan, not just a positive pregnancy test. 

We are constantly researching and auditing our practice to ensure our success rates continue to improve. You may wish to read more about research at Guy's Hospital.


Patient stories

Hear from couples who have been successfully helped by our centre.