How egg-sharing works

IVF treatment begins with stimulation of the ovaries to produce eggs. Generally, the result is the production of between 10-12 eggs, but UK law allows only one or two embryos to be transferred to the uterus. Remaining embroys can be frozen, but in most cases not all are used, even for subsequent treatments. Thus many women undergoing IVF have more eggs than they will never need. With consent, these surplus eggs can be shared with those who need them, as shown below.