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The Prevention of Acute Tubular Necrosis in Renal Transplantation by Chronic Salt Loading of the Recipient. (PDF, 627 KB) ANZ Journal of Surgery, 1974. Microsurgery Successful in Vasectomy Reversals. (PDF, 156 KB) The New York Times, 1975. Ideally, using strict morphology criteria, a minimum of 5 – 15% normal forms leads to a better ability for sperm to fertilize the egg. Causes in men The following are common causes of infertility in men. 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. Infertility may be caused by blockage of the Fallopian tube due to malformations, infections such as chlamydia or scar tissue.

Ejaculation disorders Some men experience ejaculation problems that can make it difficult for them to release semen during sex (ejaculate). This produces a sensation of pain that may extend to the patient's shoulders.

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Sexually transmitted infections (STIs): Chlamydia can damage the fallopian tubes in a woman and cause inflammation in a man's scrotum. There are four parameters analyzed: 1) semen volume – should be at least 1. In recent years, electronic tools have been developed to aid surgeons. This should be followed by documentation of ovulation via serum progesterone. Guidance from the National Institute for Health and Care Excellence (NICE) says women under the age of 42 should be offered three full cycles of IVF, with access for same-sex couples if surrogacy or privately funded fertility treatment fails.

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Vasectomy and its Microsurgical Reversal. (PDF, 17 MB) Urologic Clinics of North America, 1978. Painful or heavy periods Most women experience cramps with their periods. Vitrification of oocytes from endangered Mexican gray wolves (Canis lupus baileyi). (PDF, 319 KB) Theriogenology, 2010.

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What decreases a man’s chance of impregnating a woman? Normal Pregnancies Resulting from Testicular Sperm Extraction and Intracytoplasmic Sperm Injection for Azoospermia Due to Maturation Arrest. (PDF, 6 MB) Fertility and Sterility, 1996. Blood test: This can assess hormone levels and whether a woman is ovulating. Microscopic Vasectomy Reversal 30 Years Later: A Summary of 4010 Cases by the Same Surgeon. (PDF, 295 KB)Journal of Andrology, 2004. Ovulation often can be detected by keeping a menstrual calendar or using an ovulation predictor kit. Aetiology of Congenital Absence of Vas Deferens: Genetic Study of Three Generations. (PDF, 4 MB) Human Reproduction, 1993. The severity usually depends on how near to the testicles the radiation was aimed. Treatment is with human menopausal gonadotropin (HMG) or exogenous FSH. Other risk factors for infertility Other risk factors may also contribute to infertility in both men and women. Issues with the regulation and production of reproductive hormones are a potential cause. In other cases, the cause is suspected to be immunological or genetic; it may be that each partner is independently fertile but the couple cannot conceive together without assistance. Females[edit] The following causes of infertility may only be found in females. The fluid comes from the prostate gland, the seminal vesicle, and other sex glands.