How Many Eggs Do You Actually Need to Freeze? The Complete Guide to Egg Freezing & IVF

takeaways

1. Embryo freezing and egg freezing differ significantly: embryos are frozen at the blastocyst stage as a 'known entity' with proven potential, whereas an egg is a single cell whose capability to fertilise and develop is unknown.

2. The AMH (anti-Müllerian hormone) level indicates how many follicles/eggs a clinic could potentially retrieve in a stimulation cycle, but it is not a measure of natural fertility or ability to conceive.

3. Male fertility is declining sharply — sperm counts have fallen roughly 50% in 50 years — with lifestyle factors, vaping, anabolic steroids and heat cited as influences; sperm regenerates every 72-77 days so changes can be made.

4. Egg freezing improved dramatically after the 2010 shift to vitrification, but only around 5-15% of women who freeze eggs return to use them, and it is not a guarantee of a baby.

5. PGT-A genetic testing is discussed as a selection tool for women over 35-37 to identify chromosomally normal embryos, reducing failed transfers and miscarriage risk, though it cannot improve the embryos themselves.

6. Access to IVF in the UK is a growing concern, with NHS funding declining and a large majority of treatment expected to be privately funded by 2027, against a backdrop of falling national fertility rates.

chapters