Currently we would expect the success rates for egg freezing would be
  • for a woman aged 35 or under, one stimulated cycle would result in the collection of 10 – 12 eggs of which 7 – 9 would be suitable for vitrification and storage
  • Approximately 80-90% if eggs would survive warming in the future
  • Approximately 50-80% of surviving eggs would fertilise
  • Approximately 80-90% if fertilised eggs would develop into embryos
  • A single embryo would have a 20-35% change of developing into a pregnancy

Success rates are lower for women over 35 and egg freezing in women over the age of 38 is unlikely to lead to a pregnancy.

The expected success of the procedure can be ascertained from an initial assessment of the ovarian reserve using a blood test for anti-Mullerian hormone (AMH) and an ultrasound scan of the ovaries and uterus. The AMH test can provide insight into the quantity of eggs remaining, although it does not give information about the quality of the eggs.

Egg freezing cannot ever be guaranteed to lead to a pregnancy and birth of a healthy baby later in life. Women who freeze their eggs may not know the outcome for many years and may lose the opportunity to have a baby naturally.