Comparison of prolactin levels in human semen and seminal plasma.

Semen samples were collected from 35 men and the levels of prolactin in semen and seminal plasma were measured. There was no significant difference in prolactin concentrations between the two fluids (t = 0.333, P greater than 0.7). There was also no correlation between the prolactin concentration and the kinematic viscosity of the semen (r = 0.065, P greater than 0.7).