During in vitro fertilization, eggs are removed from sacs called follicles within an ovary (A). An egg is fertilized by injecting a single sperm into the egg or mixing the egg with sperm in a petri dish (B). The fertilized egg, called an embryo, is transferred into the uterus (C).
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Your donation powers the future of medicine and helps save lives.