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Further investigations may be requested according to the clinical presentation and the results of preliminary tests. The severity usually depends on how near to the testicles the radiation was aimed. One reported method to induce estrus in cats is FSH at 2 mg/cat, IM, once daily until signs of estrus appear (not administered for >5 days). Chronic anovulation is a common cause of infertility.

These injections are taken nightly, typically for 5 – 10 days, and act directly on the cells of the ovary to stimulate egg development. 5 IU q5d) until follicle development is detectable based on an elevation of the E2 levels and the presence of follicle development on sonograms.

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Human chorionic gonadotropin (Ovidrel, Pregnyl): Used together with clomiphene, hMG, and FSH, this can stimulate the follicle to ovulate. If a blockage is present, surgery may be necessary. Fertilized eggs are then transferred several days later into the woman’s uterus, where implantation and embryo development will hopefully occur as in a normal pregnancy. Common causes of infertility of females include: ovulation problems (e.g. polycystic ovarian syndrome, PCOS, the leading reason why women present to fertility clinics due to anovulatory infertility.[58]) tubal blockage pelvic inflammatory disease caused by infections like tuberculosis age-related factors uterine problems previous tubal ligation endometriosis advanced maternal age immune infertility Males[edit] The main cause of male infertility is low semen quality. Old cervix disruptions or infections of the cervical canal are a possible cause. FSH has a lower plasma concentration and longer half-life than LH, and it has less obvious pulsatile changes.

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Ductal blockage, as a result of an infection or congenital abnormality, may occur in the ducts that carry sperm from the testicles to the penis. They can be blocked due to numerous causes, including infections,  trauma or abnormal development, such as with cystic fibrosis or similar inherited conditions.

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However, these tests have only poor to moderate predictive value despite widespread use. The Disappearing Male. (PDF, 1 MB) From Towards Reproductive Certainty, 1999. Hypogonadotropic Hypopituitarism: Low pituitary gland output of LH and FSH.  This condition arrests sperm development and causes the progressive loss of germ cells from the testes and causes the seminiferous tubules and Leydig (testosterone producing) cells to deteriorate.  May be treated with the drug Serophene.  However, if all germ cells are destroyed before treatment commences, the male may be permanently infertile. Successful Vitrification of Bovine and Human Ovarian Tissue. (PDF, 3 MB) Reproductive BioMedicine Online, 2009. Carcinoma in the Bladder Left Behind. (PDF, 3 MB) The Journal of Urology, 1973. Because ovarian hyperstimulation syndrome does not occur, the patient's response is slow. The eggs may never be released or they may only be released in some cycles. Pulsatile GnRH and HCG have been used but result in only 20% achieving complete spermatogenesis. Both pituitary insufficiency and pituitary excess cause infertility.