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GlossaryOligospermia

condition of having fewer than 15 million sperm per milliliter

Oligospermia, also known as low sperm count or oligozoospermia, is a condition where a man has fewer than 15 million sperm per milliliter of semen. This can affect fertility, making it more difficult for a couple to conceive naturally. Causes can include hormonal imbalances, genetic factors, lifestyle choices, and certain medical conditions.

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research Androgen Receptor Gene CAG and GGN Polymorphisms in Infertile Nigerian Men

26 citations, November 2009 in “Journal of Endocrinological Investigation”

Certain gene variations are not a major cause of male infertility in Nigerian men.

research 5α-Reductase Inhibitors and Male Reproduction

15 citations, January 2017 in “Advances in Experimental Medicine and Biology”

5α-Reductase inhibitors can negatively affect male sexual function and, in some cases, significantly reduce sperm count, but these effects may be reversible.

research Finasteride and Male Infertility: A Case for Prospective Collaborative Research Databases

1 citations, September 2013 in “Fertility and Sterility”

Finasteride discontinuation increases sperm count in men.

research An Update on Congenital Adrenal Hyperplasia

151 citations, December 2004 in “Annals of the New York Academy of Sciences”

Congenital Adrenal Hyperplasia is a genetic disorder with two forms, causing symptoms like early puberty and severe acne, but can be identified through screening and treated with glucocorticoids.

research Spontaneous Fertility in a Male Patient with Testotoxicosis Despite Suppression of FSH Levels

3 citations, February 2018 in “Human Reproduction”

A man with testotoxicosis was fertile despite low FSH levels, suggesting high testosterone may allow sperm production without FSH.

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