In vitro maturation (IVM) , like stimulated normal IVF, involves the retrieval of eggs from a woman's ovaries, followed by fertilization in a lab, and then implantation of one or more fertilized embryos back into the woman's uterus.
The crucial difference is the state of the eggs at retrieval: With IVF, the eggs are matured inside the ovaries, while in IVM collected immature eggs are placed in a petri dish and exposed to a combination of luteinizing hormones and follicle stimulating hormones.
The eggs are typically left in this medium for 24 to 48 hours.
If they've reached maturation, they're then inseminated.
The newly formed embryos are then transferred back into the uterus as planned by the clinitial.