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Female infertility
Female infertility refers to infertility in female humans. It affects an estimated 48 million women〔 with the highest prevalence of infertility affecting people in South Asia, Sub-Saharan Africa, North Africa/Middle East, and Central/Eastern Europe and Central Asia.〔Mascarenhas, M.N., Flaxman, S.R., Boerma, T., Vanderpoel, S., Stevens, G.A. (2012). "National, Regional, and Global Trends in Infertility Prevalence Since 1990: A Systematic Analysis of 277 Health Surveys "PLOS Med (9;12) e1001356. 〕 Infertility is caused by many sources, including nutrition, diseases, and other malformations of the uterus. Infertility affects women from around the world, and the cultural and social stigma surrounding it varies.
==Definition==
There is no unanimous definition of female infertility, because the definition depends on social and physical characteristics which may vary by culture and situation. NICE guidelines state that: "A woman of reproductive age who has not conceived after 1 year of unprotected vaginal sexual intercourse, in the absence of any known cause of infertility, should be offered further clinical assessment and investigation along with her partner."〔(Fertility: assessment and treatment for people with fertility problems ). NICE clinical guideline CG156 - Issued: February 2013〕 It is recommended that a consultation with a fertility specialist should be made earlier if the woman is aged 36 years or over, or there is a known clinical cause of infertility or a history of predisposing factors for infertility.〔 According to the World Health Organization (WHO), infertility can be described as the inability to become pregnant, maintain a pregnancy, or carry a pregnancy to live birth.〔World Health Organization 2013. "Health Topics: Infertility". Available http://www.who.int/topics/infertility/en/. Retrieved November 5, 2013.〕
A clinical definition of infertility by the WHO and ICMART is “a disease of the reproductive system defined by the failure to achieve a clinical pregnancy after 12 months or more of regular unprotected sexual intercourse.” Infertility can further be broken down into primary and secondary infertility. Primary infertility refers to the inability to give birth either because of not being able to become pregnant, or carry a child to live birth, which may include miscarriage or a stillborn child.
〔World Health Organization 2013."Sexual and reproductive health: Infertility definitions and terminology". Available http://www.who.int/reproductivehealth/topics/infertility/definitions/en/.Retrieved November 5, 2013.〕〔Rutstein, Shea O., and Iqbal H. Shah. "Infecundity, Infertility, and Childlessness in Developing Countries." DHS Comparative Reports No. 9 (2004): 1-57.〕 Secondary infertility refers to the inability to conceive or give birth when there was a previous pregnancy or live birth.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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