In vitro fertilisation (or fertilization; IVF) is a process by which an egg is fertilised by sperm outside the body: in vitro ("in glass"). The process involves monitoring and stimulating a woman's ovulatory process, removing an ovum or ova (egg or eggs) from the woman's ovaries and letting sperm fertilise them in a liquid in a laboratory. The fertilised egg (zygote) is cultured for 2–6 days in a growth medium and is then implanted in the same or another woman's uterus, with the intention of establishing a successful pregnancy..

Blocked or damaged fallopian tubes
Male factor infertility including decreased sperm count or sperm motility
Women with ovulation disorders, premature ovarian failure, uterine fibroids
Women who have had their fallopian tubes removed
Individuals with a genetic disorder
Unexplained infertility

The success rate of IVF clinics depends on a number of factors including reproductive history, maternal age, cause of infertility, and lifestyle factors. It is also important to understand that pregnancy rates are not the same as live birth rates.
In the United States, the live birth rate for each IVF cycle started is approximately:
41-43% for women under age 35
33-36% for women ages 35 to 37
23-27% for women ages 38 to 40
13-18% for women ages over 40