Justification not yet generated — showing supporting facts

• Medical professionals typically conduct symptom assessments and order blood tests, including total testosterone, bioavailable or free testosterone, SHBG, LH, FSH, estradiol, cortisol rhythms, thyroid markers, and basic metabolic panels, to diagnose male hormonal issues.
• To produce the critical concentration of estradiol required to initiate positive feedback for the luteinizing hormone (LH) surge, the dominant follicle is almost always greater than 15mm in diameter as measured by ultrasound.
• The luteinizing hormone (LH) surge is initiated by a dramatic rise in estradiol produced by the preovulatory follicle.
• The secretion of progesterone and estradiol during the luteal phase is episodic and correlates closely with pulses of Luteinizing hormone (LH) secretion.
• The pre-ovulatory fall in estradiol may be caused by luteinizing hormone (LH) downregulation of its own receptor or by direct inhibition of estradiol synthesis by progesterone.
• For the positive feedback effect of Luteinizing hormone (LH) release to occur, estradiol levels must be greater than 200 pg/mL for approximately 50 hours.
• Estradiol levels fall dramatically immediately prior to the luteinizing hormone (LH) peak.
• The menstrual cycle is regulated by the hormones GnRH, FSH, LH, estradiol, and progesterone.
• The secretion of progesterone and estradiol during the luteal phase is episodic and correlates closely with pulses of LH secretion.
• In the presence of estradiol, follicle-stimulating hormone (FSH) stimulates the formation of luteinizing hormone (LH) receptors on granulosa cells, allowing for the secretion of small quantities of progesterone and 17-hydroxyprogesterone (17-OHP), which may exert a positive feedback on the estrogen-primed pituitary to augment LH release.
• For the positive feedback effect of Luteinizing hormone (LH) release to occur, estradiol levels must exceed 200 pg/mL for approximately 50 hours.
• The two-cell, two-gonadotropin hypothesis of regulation of estrogen synthesis in the human ovary states that LH stimulates theca cells to produce androstenedione, which is then transported to granulosa cells where it is aromatized to estrone and converted to estradiol by 17-β-hydroxysteroid dehydrogenase type I.
• Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) promote ovulation and stimulate the ovaries to secrete the sex hormones estradiol (an estrogen) and progesterone.
• Sherman B.M., West J.H., and Korenman S.G. published a 1976 study in the Journal of Clinical Endocrinology and Metabolism analyzing LH, FSH, estradiol, and progesterone concentrations during the menstrual cycles of older women.
• Estradiol levels fall dramatically immediately prior to the luteinizing hormone (LH) peak, potentially due to LH downregulation of its own receptor or direct inhibition of estradiol synthesis by progesterone.