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In order to elucidate the relationship between prolactin (PRL) levels and corpus luteum function in humans, assessment of temporal relationship between levels of PRL, LH, FSH, estradiol and progesterone was made in eleven normal cycling women and six short luteal women. All hormones were determined by specific radioimmunoassay. The mean PRL level in the luteal phase was higher than that in the follicular phase in normal women. On the other hand, no difference mean was seen between the PRL levels of follicular and luteal phases in short luteal women. In addition, follicular and luteal phase secretion of PRL in the short luteal phase (SLP) was lower than that in the normal control. LH and FSH in the follicular and luteal phases, estradiol secretion in the late follicular and early to mid-luteal phases in SLP were also lower than those in the control. These observations were consistent with the hypothesis that SLP is a sequel to aberrant folliculogenesis. In addition, it is inferred that low PRL levels in the SLP might be due to inadequate augmentation by estrogen, rather than giving PRL any positive controlling role in the maintenance of corpus luteum function.

Low serum levels of FSH, LH and prolactin in luteal phase inadequacy.