IVF Glossary


the narrow, lower end of the uterus.

clomiphene citrate

an oral medication used to promote ovulation by causing the pituitary gland to release more follicle-stimulating hormone (FSH) and luteinizing hormone (LH).

controlled ovarian stimulation (COS)

stimulation of the ovaries with medication to produce the development of multiple eggs rather than the single egg that normally develops each month.


the process of freezing embryos, eggs, or sperm at a low temperature to preserve for potential later use.

Adapted from Assisted Reproductive Technology: A Guide for Patients. American Society for Reproductive Medicine, 2011.