This treatment is used when a woman’s ovaries have stopped working or have reduced function due to going into menopause early; undergoing chemotherapy/radiotherapy, or for women who have not responded to medication while undergoing IVF themselves. Donated eggs come from in most cases anonymous women (Portugal, the UK and Denmark provide eggs from identity-released egg donors) who must have undergone a series of medical tests, and an assessment of their medical history and have given voluntary consent to undergo this procedure. They are normally no more than 30 years of age. The number of embryos that can be replaced is dependent on the country you are having the treatment done in but in most cases no more than 2 embryos are recommended.