Embryos not used for transfer can be frozen for transfer at a later date. Once thawed, an advantage of cryopreservation is that embryos not used for transfer during an assisted reproductive technology cycle can be stored for future use in a cycle without ovarian stimulation. Cryopreservation maximizes the chance of achieving a pregnancy from a single cycle. Cryopreservation may also lower the cost of infertility treatment because the ovulation induction, egg retrieval, insemination, and embryo culture are not required when frozen embryos are used.