The Role of Low-Dose hCG in the Late Follicular Phase of Controlled Ovarian Hyper Stimulation (COH) Protocols

Abstract

During the natural ovarian cycle, different pituitary hormones are responsible for follicle recruitment and growth. In the early follicular phase, follicle stimulating hormone (FSH) is responsible for early follicular growth and development. However, in the middle or late phase, reduction in FSH levels will occur and LH gains the more important role. The more COH protocol can mimic the natural hormonal situations, the more efficacious it will be.