New figures suggest more than 8 million infants have been born globally as a result of in vitro fertilisation (IVF) and other advanced fertility treatments.
The figures were presented at the 34th annual meeting of the European Society of Human Reproduction and Embryology (ESHRE) in Barcelona this week.
It is estimated more than a half million infants are now born annually through IVF and intra-cytoplasmic sperm injection (ICSI), from more than 2 million treatment cycles performed.
In Europe, Spain remains the most active country in assisted reproduction with a record 119,875 treatment cycles performed there in 2015, ahead of Russia (110,723 cycles). The data show the availability of assisted reproduction treatment remains very patchy in Europe, with only a minority of countries meeting the need for around 1,500 cycles per million population per year.
Pregnancy rates, as measured per embryo transfer, have stabilised in Europe at about 36 per cent for both IVF and ICSI. Pregnancy rates are higher with five-day than with three-day old embryos. The rate of twin pregnancy continues to decline, while the rate of single embryo transfers is rising. Pregnancy rates from egg donation continue to rise and now stand at about 50 per cent.