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At birth, women have all their follicles for folliculogenesis, and they steadily decline until menopause." [17] In terms of ovarian reserve, a typical woman has 12% of her reserve at age 30 and has only 3% at age 40. [18] 81% of variation in ovarian reserve is due to age alone, [18] making age the most important factor in female infertility.
About 95 out of 100 couples who are trying to get pregnant do so within two years. [90] Women become less fertile as they get older. For women aged 35, about 94% who have regular unprotected sexual intercourse get pregnant after three years of trying. For women aged 38, however, only about 77%. The effect of age upon men's fertility is less ...
Usually, affected men show no symptoms, although they may have smaller testes. Men with this condition may exhibit azoospermia (no sperm production), oligozoospermia (small number of sperm production), or they may produce abnormally shaped sperm (teratozoospermia). [20] This case of infertility occurs during the development of gametes in the male.
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Chance of fertilization by menstrual cycle day relative to ovulation [14] Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. [15] For optimal pregnancy chance, there are recommendations of sexual intercourse every 1 or 2 days, [16] or every 2 or 3 days. [17]
If the woman has a condition making it possible, but unlikely to conceive, this is termed "subfecundity." Venereal diseases (especially gonorrhea , syphilis , and chlamydia ) are common causes. Nutrition is a factor as well: women with less than 20% body fat may be subfecund, a factor of concern for athletes and people susceptible to anorexia .
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.
Men often learn they have Sertoli cell-only syndrome between the ages of 20 and 40 when they are checked for infertility and found to produce no sperm. Other signs and symptoms are uncommon, yet in some cases, an underlying cause of SCO syndrome, such as Klinefelter syndrome , may produce other symptoms.
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related to: i ovulate but can't conceive cells in men menopause is making it hard