In vitro fertilization (IVF) is a medical procedure in which mature eggs are removed from a woman, fertilized with male sperm in a laboratory, and inserted into the uterus of the same or another woman for pregnancy. The IVF procedure involves the extraction (by needle aspiration) of mature eggs and the incubation of the eggs in a culture medium, as well as the collection and preparation of sperm and its addition to the medium. After fertilization, the potential embryo is placed in a culture medium, where its division into the two-cell, four-cell, and eight-cell stages is periodically observed. The blastocyst is introduced through the cervix into the uterus, where it floats freely for about three and a half days. If the procedure is successful, the embryo is implanted in the wall of the uterus, and pregnancy occurs. In vitro fertilization is performed only after a comprehensive evaluation of infertility.