Estrogens
Estrogens are a class of steroid sex hormones essential for female reproductive development and function. The three principal endogenous forms are estradiol (E2), estrone (E1), and estriol (E3). Granulosa cells of developing ovarian follicles produce estradiol, the dominant and most potent form in reproductive-aged women.
Estrogens drive endometrial proliferation, promote fertile-quality cervical mucus production, stimulate the preovulatory LH surge through positive hypothalamic-pituitary feedback, and support follicle maturation. During pregnancy, estriol facilitates uterine growth, placental blood flow, and fetal organ development.
In Restorative Reproductive Medicine, cycle-timed estradiol measurements are central to the comprehensive hormonal panel. Draws at early follicular (cycle days 3 to 5) and post-peak phases allow RRM clinicians to assess follicular adequacy, luteal function, and estrogen support for the endometrium, rather than relying on a single snapshot.
This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.