Cryopreservation could be done as oocyte cryopreservation right before fertilisation, or as embryo cryopreservation immediately after fertilisation. Husbands are asked to provide a sperm sample. To obtain very good fertilization the lab tries to isolate rapidly swimming sperm with very good morphology. On top of that, adverse results throughout pregnancy https://keybookmarks.com/story18476101/about-assisted-reproductive-technology