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Ovulatory menstrual periods tend to be regular and predictable in terms of cycle length, duration and heaviness of bleeding, and other symptoms. Unexplained infertility[edit] In the US, up to 20% of infertile couples have unexplained infertility.[61] In these cases abnormalities are likely to be present but not detected by current methods.

Spermatid Conception. (PDF, 1 MB) Human Reproduction, 1998. Affected individuals displayed more severe forms of infertility such as azoospermia and severe oligozoospermia.[27] Other causes[edit] Factors that can cause male as well as female infertility are: DNA damage DNA damage reduces fertility in female ovocytes, as caused by smoking,[28] other xenobiotic DNA damaging agents (such as radiation or chemotherapy)[29] or accumulation of the oxidative DNA damage 8-hydroxy-deoxyguanosine[30] DNA damage reduces fertility in male sperm, as caused by oxidative DNA damage,[31] smoking,[28] other xenobiotic DNA damaging agents (such as drugs or chemotherapy)[32] or other DNA damaging agents including reactive oxygen species, fever or high testicular temperature.[33] The damaged DNA related to infertility manifests itself by the increased susceptibility to denaturation inducible by heat or acid [34] or by the presence of double-strand breaks that can be detected by the TUNEL assay.[35] General factors Diabetes mellitus,[36][37] thyroid disorders,[38] undiagnosed and untreated coeliac disease,[39][40][41][42] adrenal disease[43] Hypothalamic-pituitary factors Hyperprolactinemia Hypopituitarism The presence of anti-thyroid antibodies is associated with an increased risk of unexplained subfertility with an odds ratio of 1. If too many embryos develop, one or more can be removed. Breeding with a proven fertile male must occur at the optimal time for the female. Sterilisation involves blocking the fallopian tubes to make it impossible for an egg to travel to the womb. Treatment of Hemorrhage from Renal Trauma by Angiographic Injection of Clot. (PDF, 1 MB) The Journal of Urology, 1978.

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Several studies have demonstrated that an increase in BMI is correlated with a decrease in sperm concentration, a decrease in motility and an increase DNA damage in sperm. Laparoscopic techniques have also been developed in the field of veterinary medicine. Kidney Transplantation in Inbred Rats. (PDF, 6 MB) The American Journal of Surgery, 1973.

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Surgeons who choose this hand-assist technique feel it reduces operative time significantly versus the straight laparoscopic approach. Age: Male fertility starts to fall after 40 years.

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Patients may have a normal palpable vas deferens bilaterally but show decreased ejaculate volume and hemospermia and may experience pain upon ejaculation. This prevents the sperm from fertilizing the egg. Ejaculation disorders: If the ejaculatory ducts are blocked, semen may be ejaculated into the bladder Hormonal imbalance: Hypogonadism, for example, can lead to a testosterone deficiency. Retrograde Ejaculation: Is a condition in which semen is ejaculated into the bladder rather than out through the urethra because the bladder sphincter does not close during ejaculation.  If this disorder is present, ejaculate volume is small and urine may be cloudy after ejaculation.  This condition affects 1. It can also help if a man has severe erectile dysfunction. Problems with the female reproductive system can also contribute to fertility issues.Table of contents Causes in men Causes in women Treatment Types Diagnosis Complications Outlook It may be that one partner cannot contribute to conception, or that a woman is unable to carry a pregnancy to full term. Pregnancies after Testicular Sperm Extraction and Intracytoplasmic Sperm Injection in Non-obstructive Azoospermia. (PDF, 3 MB) Human Reproduction, 1995. Genital duct obstruction is a potentially curable cause of infertility and is observed in 7% of infertile patients.