Additional Gamete and Embryo Procedures
If there is a low number, motility or low or no fertilizing capacity of the sperm fertilization can be achieved through intracytoplasmic sperm injection (ICSI). During ICSI, the embryologist injects one sperm into one egg.
If more healthy embryos are available than the number recommended for transfer, cryopreservation of the additional embryos can be performed. Embryo freezing is accomplished using a technique known as vitrification. Frozen/thawed embryo transfer during a subsequent cycle gives the couple additional chances for pregnancy. Multiple pregnancies may be established from a single retrieval cycle using this technique.
Assisted Zona Hatching
Assisted zona hatching (AZH), another micromanipulation technique, facilitates embryo hatching from sometimes overly thick or hardened zona pellucida, the “egg shell”.