Does Luteal Phase Deficiency Exist and What is its Association with Infertility?

Jones studied the luteal phase by evaluating basal body temperature charts, urinary pregnanediol excretion (48-hour urine collection at the peak of luteal phase by basal body temperature), cervical mucus, and most importantly, timed endometrial biopsies. In the initial study, Jones evaluated 255 cycles in 98 women with infertility that was not due to tubal, uterine, anovulation or male factor.