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Oligozoospermia, refers to semen with a low concentration of sperm〔(thefreedictionary.com > oligospermia ) Citing: Dorland's Medical Dictionary for Health Consumers, 2007 by Saunders; The American Heritage Medical Dictionary 2007, 2004 by Houghton Mifflin Company; Mosby's Medical Dictionary, 8th edition 2009; McGraw-Hill Concise Dictionary of Modern Medicine, 2002 by The McGraw-Hill Companies〕 and is a common finding in male infertility. Often semen with a decreased sperm concentration may also show significant abnormalities in sperm morphology and motility (technically "oligoasthenoteratozoospermia"). There has been interest in replacing the descriptive terms used in semen analysis with more quantitative information.〔Grimes DA & Lopez LM 2007 ''Fertility and Sterility'' 88(6) 1491-94.〕 ==Diagnosis== The diagnosis of oligozoospermia is based on one low count in a semen analysis performed on two occasions. For many decades sperm concentrations of less than 20 million sperm/ml were considered low or oligospermic, recently, however, the WHO reassessed sperm criteria and established a lower reference point, less than 15 million sperm/ml, consistent with the 5th percentile for fertile men. Sperm concentrations fluctuate and oligospermia may be temporary or permanent. Sources usually classify oligospermia in 3 classes:〔Padubidri; Daftary (2011). ''Shaw's Textbook of Gynaecology, 15e''. p. 204. ISBN 9788131225486〕 *Mild: concentrations 10 million – 20 million sperm/ml *Moderate: concentrations 5 million – 10 million sperm/ml *Severe: concentrations less than 5 million sperm/ml The diagnosis of oligozoospermia requires a work-up via semen analysis (listed in Male infertility). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oligospermia」の詳細全文を読む スポンサード リンク
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