Oocytes can be obtained either from known or anonymous donors

Known donor:
Any patient who desires to obtain oocytes from a known donor should seek a woman between 26 and 30 with no known medical or genetic problems. Screening tests performed to the donor are standardized and applied according to the guidelines published by ESHRE and ASRM.

Anonymous donor:
When the donor is anonymous, both the identities of donor and recipient are kept discreet. Any woman who applies to the anonymous donor program is first evaluated physically and psychologically. Presence of any medical, genetic or transmissable diseases are be discarded. A donor should be a healthy woman between the ages of 20 and 30 preferably with children.