Immunoreactive relaxin in seminal plasma of man.

Relaxin in seminal fluid was determined radioimmunologically in 238 andrological patients with various ejaculate qualities. In 52 cases, a second ejaculate was examined 4 to 6 weeks later. Relaxin was found present in each ejaculate sample. There was no significant difference between the relaxin values of the reexamined cases and the original samples, indicating little fluctuation. Statistical correlations between relaxin levels in seminal plasma and clinical data, ejaculate, and hormonal parameters could not be established. Only cases with low fructose values showed some correlation with low relaxin levels in seminal plasma.