Human pregnancy following cryopreservation thawing and transfer of an eight-cell embryo. For a few years in the s the waiting period to receive an IVF-treatment was seven years.
First, to improve the chances that a woman would become pregnant with one fetus that would survive to term, physicians began fertilizing multiple oocytes and implanting multiple embryos. New York: Parthenon Publishing Group; An unusual report of the possibility that abnormal spermatozoa could be enriched and give rise to healthy babies.
Simplified hormone stimulation Initially hormone stimulation was a complicated and cumbersome process for the woman.
Pregnancy after in vitro fertilization of human follicular oocytes collected from nonstimulated cycles, their culture in vitro and their transfer in a donor oocyte program. The first report in which spermatids were used to achieve pregnancy. Pregnancies after testicular sperm extraction and intracytoplasmic sperm injection in non-obstructive azoospermia.