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Counseling about options should be offered to couples who are not physically able to conceive (i.e., same-sex couples or persons lacking reproductive organs). Infertility caused by DNA defects on the Y chromosome is passed on from father to son.

Diet: A lack of folic acid, iron, zinc, and vitamin B-12 can affect fertility. The main approach to correcting or removing these uterine abnormalities is by hysteroscopy, a surgical method by which a narrow scope with a camera is placed within the uterine cavity.

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Microscopic Vasoepididymostomy: Specific Microanastomosis to the Epididymal Tubule. (PDF, 15 MB) Fertility and Sterility, 1978. 8-Mb Deletion in the Azoospermia Factor c Region. (PDF, 332 KB) Genomics, 2004. Cholesterol One study has found that high cholesterol levels may have an impact on fertility in women. For this reason, it is less likely to adversely affect the endometrium and cervical mucus. 25 Women with no clear risk of tubal obstruction should be offered hysterosalpingography to screen for tubal occlusion and structural uterine abnormalities.

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If no improvement occurs, depending on the amount of functional sperm recovery after the sperm wash, the decision must be made to proceed with either intrauterine insemination or in vitro fertilization. Microscopic Vasectomy Reversal. (PDF, 31 MB) Fertility and Sterility, 1977.

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0.[44] Environmental factors Toxins such as glues, volatile organic solvents or silicones, physical agents, chemical dusts, and pesticides.[45][46] Tobacco smokers are 60% more likely to be infertile than non-smokers.[47] German scientists have reported that a virus called adeno-associated virus might have a role in male infertility,[48] though it is otherwise not harmful.[49] Other diseases such as chlamydia, and gonorrhea can also cause infertility, due to internal scarring (fallopian tube obstruction).[50][51][52] Alimentary habits[53] Obesity: The obesity epidemic has recently become is a serious issue, particularly in industrialized nations. Bladder neck closure during ejaculation is vital to ensure antegrade ejaculation. Endometriosis can only be confirmed by surgery, usually laparoscopy. The elevated temperature hinders the maturation process of sperm, which develop best in an environment that is slightly cooler than body temperature. 8 Counseling on lifestyle modifications is reasonable because exposures to tobacco and alcohol are associated with lower rates of fertility. Its mechanism of action is still not well understood, but it competes for the estrogen receptor at the hypothalamus, pituitary, and ovarian levels. Cervical factors are also thought to play a minor role, although they are rarely the sole cause. Cervical surgery can sometimes cause scarring or shortening of the cervix. A varicocele is a varicose vein found in the scrotum. Spermatid Conception. (PDF, 1 MB) Human Reproduction, 1998.