Is the luteal phase really the best time to run a marathon?
In some women, infertility is due to a hormonal abnormality known as luteal phase defect.
A successful pregnancy ensued following the surgical removal of a large endometrioma and treating a luteal phase deficiency.
Significantly shorter luteal phase length and longer follicular phase length were observed in the cycles with luteal dysfunction.
Provided an active corpus luteum is present it will cause luteal regression which will be followed by follicle growth, oestrus and ovulation.
Increased progesterone levels are also seen occasionally with luteal ovarian cysts, molar pregnancies, and with a rare form of ovarian cancer.