In IVF fertilization of wife’s eggs and husband’s sperm is done outside the body, in the laboratory. The woman is given medications to stimulate the ovary to produce about 8-10 eggs. These are retrieved transvaginally by an ultrasound-guided procedure under anaesthesia. Husband’s semen is processed and good motile sperms are incubated alongside the eggs in an incubator. The resulting embryos are transferred in the cleavage stage (Day3) or blastocyst stage (Day 5) depending on the numbers and grading of the embryos. Extra embryos are preserved by freezing (vitrification).