Biological significance of human prolactin in adult, healthy and infertile males.

The human prolactin (hP) levels have been studied in adult healthy and infertile males. The hormone level was 8.5--38.0 ng/ml in sperm-plasma and 3.4--32 ng/ml in blood plasma. Values for normo and pathospermic patients showed no significant difference. In normo and hypospermia the hP level was higher in the ejaculate than in blood plasma. There was a close correlation between the hP and fructose levels of the ejaculate, while the correlation between hP and testosterone levels in the ejaculate was not highly significant. There is a certain relationship between the plasma hP and testosterone levels and the sperm count.