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For in-vitro fertilization, a 100,000 of sperm are necessary and, for the intracytoplasmatic sperm injection, only a few sperms are required. Diagnosis and Management of Hypogonadism, Infertility, and Impotence. (PDF, 13 MB) Chapter 22 of textbook,Male Reproductive Dysfunction, 1986.

Causes Potential causes of male infertility are: The complete absence of sperm (azoospermia) Low sperm count (oligospermia) Abnormal sperm shape (teratozoospermia) Problems with sperm movement (asthenozoospermia) Sperm that is completely immobile (necrozoospermia); the sperm may be alive and not moving, or they may be dead Problems with sperm delivery, due to sexual dysfunction, an obstruction, previous vasectomy, or retrograde ejaculation Problems with erections or other sexual problems There are a variety of conditions that may lead to male infertility. Afterward, the mucus specimen is phase-microscopically examined. Using these criteria, he reported a clinically significant threshold of 14% normal forms as an excellent predictor of IVF success. This leads to the final maturation and release of the egg.

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For men, a visual inspection of sexual characteristics can identify such endocrinopathies as hypogonadism (a condition resulting in atrophy or deficient development of secondary sexual characteristics) or Klinefelter’s syndrome (a genetic anomaly often associated with infertility). The vas deferens carries sperm from the epididymis to the ejaculatory duct and the urethra.

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Fertilization takes place outside the body, and the fertilized egg is reinserted into the woman's reproductive tract, in a procedure called embryo transfer. Histological dating of timed endometrial biopsy tissue is not related to fertility status.

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National Collaborating Centre for Women's and Children's Health. Intra-uterine insemination for unexplained subfertility. 7 million women reported impaired ability to get pregnant or carry a baby to term. They're then stored inside yards of “plumbing” called the epididymis, which lies on top of each testicle. Successful Pregnancy and Delivery after Calcium Ionophore Oocyte Activation in a Normozoospermic Patient with Previous Failed Fertilization after Intracytoplasmic Sperm Injection. (PDF, 57 KB) Fertility and Sterility, 2003. These microdeletions are not observed on regular karyotype testing; rather, their identification requires polymerase chain reaction (PCR)–based sequence-tagged site mapping or Southern blot analysis. Women in group II include those with polycystic ovary syndrome and hyperprolactinemia. Causes in women Infertility in women can also have a range of causes. Your doctor may ask you many of the following questions: How long have you been trying to get pregnant? CAH may be due to the congenital deficiency of one of several adrenal enzymes, the most common of which is 21-hydroxylase deficiency.