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At least one open tube is required for IUI, and any sperm abnormality cannot be severe, otherwise the sperm will not be able to swim to and fertilize the egg. Not long after, the United States delivered its first IVF baby, and the use of IVF has grown dramatically.

However, early referral of infertile couples to a dedicated specialist infertility clinic may be indicated to increase their chance of pregnancy (Table ). Postcoital testing and antisperm antibody testing are no longer considered useful in this evaluation. However, these tests have only poor to moderate predictive value despite widespread use.

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Hypothalamic-pituitary-gonadal axis stimulatory and inhibitory signals. The results of these tests help determine the best fertility treatment.

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If the egg does not travel, it can be harder to conceive naturally. The enzyme aromatase is responsible for this conversion, and is found primarily in adipose tissue. Drugs, assisted reproductive technology, and surgery are common treatments. It's often caused by a sexually transmitted infection (STI).

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Operative laparoscopy: This technique is indicated for pedunculated and superficial intramural myomas. Up to 2 percent of men are thought to have suboptimal sperm. The fertilized eggs, now embryos, are allowed to grow and develop in culture media for typically 3 to 5 days. The Relationship of Abnormal Semen Values to Pregnancy Outcome. (PDF, 770 KB) Chapter 10 from textbook, 1992. Results of one study investigating a cohort of 315 men revealed changes within the hinge region of SF-1 and no rare allelic variants in fertile control men. Possible problems could be that the egg is not released at the optimum time for fertilization, that it may not enter the fallopian tube, sperm may not be able to reach the egg, fertilization may fail to occur, transport of the zygote may be disturbed, or implantation fails.