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FSH levels in this time is often called basal FSH levels, to distinguish from the increased levels when approaching ovulation. [17] FSH is measured in international units (IU). For Human Urinary FSH, one IU is defined as the amount of FSH that has an activity corresponding to 0.11388 mg of pure Human Urinary FSH. [18]
FSH levels are elevated early in the cycle of women who have lower ovarian reserve, because their follicles do not produce enough estrogen to inhibit FSH production, [14] therefore high levels early on in a woman's menstrual cycle can indicate lower ovarian reserve and lower likelihood of retrieving eggs for IVF.
Many endocrinologists believe that the estrogen secretion of the dominant follicle has increased to a level that GnRH production is suppressed, which lowers the levels of LH and FSH. This slowdown in LH and FSH production leads to the atresia (death) of most of the recruited follicles, though the dominant follicle continues to mature. Estrogen ...
The Mira fertility monitor, however, is a little different. It has an AI so that it learns your patterns over time, and will figure out when you're ovulating potentially weeks before it happens.
The x-axis shows the time of the menstrual cycle in days. The time scale starts with the beginning (or "onset") of (last) menstrual period (LMP), given as day number. Day number 1 corresponds to 0 to 0.99 days from LMP, and Day number 2 corresponds to 1.00 to 1.99 days from LMP and so forth.
This gives the possibility of using the data to predict fertility for natural contraception and pregnancy planning. Urine levels of the hormone pregnanediol 3-glucuronide of over 5 μg/mL has been used to confirm ovulation. This test has a 100% specificity over 107 women. [30]
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