Seminal immunoreactive prolactin before and after vasectomy.

Seminal fluid was assayed for prolactin by radioimmunoassay in eleven healthy males 8-12 weeks following vasectomy. The results were compared with those obtained in 34 age matched subjects prior to undergoing vasectomy. The mean values (+/- 1 SD) for prolactin were similar (postvasectomy = 11.4 +/- 3.2 ng/ml, prevasectomy = 12.7 +/- 6.1 ng/ml) and there was no statistically significant difference (t = 0.66, P = greater than 0.05). This study shows that prolactin is found in secretions of the prostate and/or seminal vesicles.