Britannica Sources used in this answer

How does zygote intrafallopian transfer differ from standard IVF?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Diagram showing the female reproductive system with labeled ovaries, fallopian tubes, uterus, and vagina, alongside hormone pathways and the process from ovulation to fertilization and early embryo development. — infertility Major structures and hormones involved in the initiation of pregnancy. Also seen, at right, is the development of an egg cell (ovum) from follicle to embryo.

Zygote intrafallopian transfer (ZIFT) and standard in vitro fertilization (IVF) are both assisted reproductive technologies used to address infertility, but they differ primarily in the site of embryo placement.

In standard IVF, mature eggs are fertilized with sperm outside the body, and the resulting embryo is introduced through the cervix directly into the uterus for gestation.1

In contrast, ZIFT is a procedure where eggs are fertilized in vitro, but the resulting fertilized eggs (zygotes) are inserted into a fallopian tube rather than the uterus. ZIFT is considered similar to gamete intrafallopian transfer, though it specifically involves the transfer of already fertilized eggs.2

While both methods aim to achieve pregnancy, the choice between them depends on individual medical circumstances, such as the health and patency of the fallopian tubes, which are often a factor in determining the most appropriate fertility treatment.1