These are assisting treatments done to get pregnant. IUI is done by inserting a catheter inside the womb to inject sperms inside the womb for fertilization.
In Vitro Fertilization (IVF), treatment involves retrieval of eggs and sperm that are mixed manually in a Petri dish and left for fertilization. Once the fertilized embryo matures, the healthy embryo is then transferred in the uterus.
ICSI stands for Intracytoplasmic Sperm Injection, in which the sperms are directly injected into the egg using a very thin needle called a micropipette. Once fertilization takes place, it develops into an embryo.