| Literature DB >> 3135208 |
A S Burris1, R V Clark, D J Vantman, R J Sherins.
Abstract
In order to define the minimal number of sperm needed for conception, we studied semen characteristics of men with isolated hypogonadotropic hypogonadism (IHH) who became sperm-positive during gonadotropin therapy. Twenty-two of 24 men (92%) proved fertile, initiating a total of 40 pregnancies. The mean (+/- standard error of the mean) sperm concentration at the time of conception was 16.7 +/- 4.0 X 10(6)/ml. However, 71% of pregnancies were conceived when the mean sperm concentration was less than 20 X 10(6)/ml; in 16%, the mean sperm concentration was less than 1 X 10(6)/ml. Mean total sperm count correlated highly with sperm concentration (r = 0.67, P less than 0.001). We conclude that men with IHH can initiate conception even when their sperm concentration is well below the conventional lower limit of 20 X 10(6)/ml.Entities:
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Year: 1988 PMID： 3135208 DOI： 10.1016/s0015-0282(16)60084-5
Source DB: PubMed Journal: Fertil Steril ISSN： 0015-0282 Impact factor: 7.329