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Under the influence of the preovulatory LH surge, the first meiotic division of the oocytes is completed. The surge also initiates luteinization of thecal and granulosa cells. [4] Ovulation normally occurs 30 (± 2) hours after the beginning of the LH surge (when LH is first detectable in urine). [13]
Chance of fertilization by menstrual cycle day relative to ovulation [35] The detection of a surge in release of luteinizing hormone indicates impending ovulation. LH can be detected by urinary ovulation predictor kits (OPK, also LH-kit) that are performed, typically daily, around the time ovulation may be expected. [36]
Ovulation is an important part of the menstrual cycle in female vertebrates where the egg cells are released from the ovaries as part of the ovarian cycle. In female humans ovulation typically occurs near the midpoint in the menstrual cycle and after the follicular phase. Ovulation is stimulated by an increase in luteinizing hormone (LH).
Ovulation occurs ~35 hours after the beginning of the LH surge or ~10 hours following the LH surge. Several days after ovulation, the increasing amount of estrogen produced by the corpus luteum may cause one or two days of fertile cervical mucus, lower basal body temperatures, or both. This is known as a "secondary estrogen surge". [4]
Ovulation occurs about 109 hours after the start of follicle growth. Estrogen peaks at about 11 am on the day of proestrus. Between then and midnight there is a surge in progesterone, luteinizing hormone and follicle-stimulating hormone, and ovulation occurs at about 4 am on the next estrus day. The following day, metestrus, is called early ...
About mid-cycle, some 10–12 hours after the increase in luteinizing hormone, known as the LH surge, [4] the dominant follicle releases an oocyte, in an event called ovulation. [10] After ovulation, the oocyte lives for 24 hours or less without fertilization, [11] while the remains of the dominant follicle in the ovary become a corpus luteum ...
The LH secretion most noticeable as a LH surge lasting 48 to 72 hours in the middle of the ovarian cycle. [3] Meiosis in the dominant follicle resumes and follicle ruptures shortly after the LH surge. [27] Ovulation can only occur if GnSAF is absent and the mid-cycle LH surge occurs. [3] [27]
In addition, as more estrogen is secreted, more LH receptors are made by the theca cells, inciting theca cells to create more androgen that will become estrogen downstream. This positive feedback loop causes LH to spike sharply, and it is this spike that causes ovulation. Following ovulation, LH stimulates the formation of the corpus luteum.
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