ICSI (India Cytoplasmic Sperm Injection) is a specialised method to form an embryo in the laboratory in which a sperm is directly injected into the ovum placed in a nutrient broth. GIFT (Gamete Intra Fallopian Transfer) is a procedure in which eggs are removed from woman's ovary with man sperm and transferred to one of the fallopian tube.
ZIFT (Zygote Intra Fallopian Transter) is a procedure (similar to in vitro fertilisation and embryo transfer in which the zygote (early embryo) up to 8 blastomeres is transferred directly intoi the Fallopian tube.
ET (Embryo Transfer) is a method in which the fertilisation occurs in vitro and the zygote formed is transferred into the uterus of the female who cannot conceive.