How does invitro work?

In vitro literally means 'in glass' and with this form of assisted conception, fertilization takes place in a glass (or more commonly, plastic) dish in the laboratory. (At one early stage, scientists used test tubes for fertilization, hence the term "test tube baby".) IVF was originally devised to overcome infertility caused by blocked or absent fallopian tubes. Today, IVF is used to treat many more reproductive problems, including irregular ovulation, low sperm count or motility, and unexplained infertility.