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Normal sperm have a smooth oval head approximately 3-5 μm long and 2-3 μm wide. Pregnancy Caused by Sperm from Vasa Efferentia. (PDF, 1 MB) Fertility and Sterility, 1988. Infertility is due to hypogonadotropic hypogonadism.

The diagnosis of congenital anestrus is based on the age of the animal and exclusion of all other possible causes (including chromosomal defects, endocrine disorders, and previous oophorectomy). In theory, it is possible to conceive on any of these 6 days that occur before and during ovulation. Source : Preserving your fertility - University of Kansas Hospital PPT Presentation Summary : Preserving your fertility.

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Assisted Reproductive Technology: Using Ejaculated, Fresh, and Frozen-thawed Epididymal and Testicular Spermatozoa Gives Rise to Comparable Results after Intracytoplasmic Sperm Injection. (PDF, 5 MB) Fertility and Sterility, 1995. Around one third of couples have difficulty conceiving due to a low sperm count. The main symptom of infertility is not getting pregnant. Risk factors for male infertility include obesity, age (over 40 -- yes, men also have biological clocks), current or previous infection of an STD, smoking, or excessive drinking.

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If a woman has an ovulation disorder, she may ovulate infrequently or not all. Assessment of ovarian reserve This is a very important assessment of a woman's remaining egg supply It is done with blood testing and ultrasound: Blood - day 3 FSH, LH and estradiol hormone testing and AMH hormone levels Ultrasound - assessment of ovarian volume and antral follicle counts Assessment of adequate ovulation This can be done in a variety of ways. Hysterosalpingography: Fluid is injected into the woman's uterus and X-rays are taken to determine whether the fluid travels properly out of the uterus and into the fallopian tubes. About half the women with hormonal imbalances do not produce enough follicles to ensure the development of an ovule, possibly due to poor hormonal secretions from the pituitary gland or the hypothalamus. Tests and trials are available, but testing does not always reveal a specific cause.

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Age plays quite a critical role, as fertility peaks for both men and women in their mid-twenties. For a woman to conceive, certain things have to happen: vaginal intercourse must take place around the time when an egg is released from her ovary; the system that produces eggs has to be working at optimum levels; and her hormones must be balanced.[54] For women, problems with fertilisation arise mainly from either structural problems in the Fallopian tube or uterus or problems releasing eggs. Human chorionic gonadotropin (Ovidrel, Pregnyl): Used together with clomiphene, hMG, and FSH, this can stimulate the follicle to ovulate. European Association of Urology guidelines on male infertility: the 2012 update. Sulfasalazine: This anti-inflammatory drug can significantly lower a man's sperm count.