Twenty-four-hour progesterone and luteinizing hormone profiles in the midluteal phase of the infertile patient: correlation with other indicators of luteal phase insufficiency.

The authors have further analyzed women diagnosed as having luteal phase insufficiency in hope of determining the value of specific screening tests as well as determining the degree of heterogeneity of pathophysiologic mechanisms involved in the disorder. Twelve women with the disorder were identified, 6 with two consecutive midluteal serum progesterone (P) levels less than 10 ng/ml (group 1) and 6 with two consecutive late luteal phase endometrial biopsies out of phase (group 2); 4 infertile women with normal serum P and late luteal biopsies also were studied (group 3). All underwent serum sampling for P and luteinizing hormone (LH) at 20-minute intervals for 24 hours, beginning at 9:00 A.M. of day 7 post-LH surge. No significant differences were noted among the three groups for LH area under the curve, pulse frequency, or pulse amplitude. Furthermore, no differences were ascertained for P area under the curve. However, individuals were identified who had one or more hormonal abnormalities but no abnormal biopsy, as well as patients with normal hormonal profiles but having abnormal endometrial development. Receiver Operating Characteristic curves demonstrated that pooled morning serum P levels provided optimal predictive ability of biopsy results. The authors conclude that luteal phase insufficiency is a heterogeneous disorder, and that neither endometrial biopsy nor serum hormonal analysis obviates the need for the other.