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The main cause of male infertility is low semen quality. In men who have the necessary reproductive organs to procreate, infertility can be caused by low sperm count due to endocrine problems, drugs, radiation, or infection. There may be testicular malformations, hormone imbalance, or blockage of the man's duct system.
A study of a population of French women from 1670 and 1789 shows that those who married at age 20–24 had 7.0 children on average and 3.7% remained childless. Women who married at age 25–29 years had a mean of 5.7 children and 5.0% remained childless. Women who married at 30–34 years had a mean of 4.0 children and 8.2% remained childless. [20]
Histopathology of various spermatogenesis disorders.. 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 ...
In studies that controlled for female partner's age, comparisons between men under 30 and men over 50 found relative decreases in pregnancy rates between 23% and 38%. [43] Sperm count declines with age, with men aged 50–80 years producing sperm at an average rate of 75% compared with men aged 20–50 years and larger differences exist in the ...
Sperm count is determined with a simple test called a semen analysis that looks at sperm concentration, or how many sperm there are per milliliter of fluid. There should be about 100,000,000 sperm ...
If sperm count remains above 60 million per ejaculate, fertility remains normal. But sperm counts are continuing to drop. At such low levels, the sperm often are incapable of successfully fertilizing the egg. A decline in male fertility often means a decline in natural fertility, as fertility is carried by both sexes.
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