ICSI is an assisted reproductive technology (ART) used to treat sperm-related infertility problems. ICSI is also used to enhance the fertilization phase of in vitro fertilization (IVF). It is a procedure in which a single sperm is injected directly into an egg. The fertilized egg is then placed in a woman’s uterus or fallopian tube.

The primary objective of ICSI is to ensure that spermatozoon goes through the oocyte membrane – i.e. fertilization. For ICSI to be successful it is enough if there are even single alive spermatozoa in ejaculate.

After the ICSI fertilization the embryo quality and pregnancy rates are the same as for the standard in-vitro fertilization.