Relaxin in non-pregnant women during ovarian stimulation.

Around pharmacologically induced ovulation, inconstant immunoreactive plasma relaxin concentrations were observed. Increasing levels appear during HCG or LH-RH induced lutinization. These values remain high as long as the corpus luteum is sustained. These observations may suggest that relaxin has a role during early luteinization and during the non-gestational lifespan of the corpus luteum in women.