• Patients who are going to go through radiotherapy or chemotherapy
• Couples who have extra embryos left after embryo transfer
• Females who are wishing to preserve their fertility
• When sperm is collected during microsurgery or by other means, and frozen for a subsequent IVF cycle, additional surgery may be avoided.

With the availability of frozen embryos, a woman does not need to undergo stimulation by fertility drugs to have an embryo transfer during an infertility treatment cycle.