IVF is generally selected according to the cause of infertility. Generation I IVF is used for infertility in which the woman’s fallopian tubes are inaccessible or ovulation is impaired or the man has oligozoospermia, Generation II IVF is used for infertility in which the man has severe oligozoospermia or one generation of eggs is unable to be fertilized, and Generation III IVF is applied to infertility in which the disease is hereditary or there is chromosomal abnormality. IVF is currently available in one, two, and three generations of assisted reproductive technology. Each generation of IVF assisted reproductive technology is suitable for different types of infertility, and you need to choose the right IVF technology for you based on the cause of infertility. The first generation of IVF is called in vitro fertilization-embryo transfer (IVF-ET), which is mainly used to solve the problem of sperm and egg not being able to meet each other, and the treatment of infertility due to the failure of female fallopian tubes or ovulation disorders, or the male partner’s oligozoospermia. The second generation of IVF is called intracytoplasmic single sperm injection, which is mainly used to solve the problem of infertility where sperms fail to fertilize the egg cells in the first generation of IVF, or the treatment of severe oligozoospermia in men and male infertility that requires testicular sperm retrieval. Three-generation IVF, known as pre-implantation genetic diagnosis (PGD), addresses infertility in couples where one of the partners may be at risk for a hereditary disease, and tests embryos for abnormal genes or chromosomes prior to transfer to place healthy embryos in the uterus. If you have IVF needs, please consult a specialist and choose the assisted reproductive technology that is right for you based on your doctor’s recommendation.