Modifies a noun

• phase: Is the luteal phase really the best time to run a marathon?

• defect: In some women, infertility is due to a hormonal abnormality known as luteal phase defect.

• deficiency: A successful pregnancy ensued following the surgical removal of a large endometrioma and treating a luteal phase deficiency.

• dysfunction: Significantly shorter luteal phase length and longer follicular phase length were observed in the cycles with luteal dysfunction.

• regression: Provided an active corpus luteum is present it will cause luteal regression which will be followed by follicle growth, oestrus and ovulation.

• cyst: Increased progesterone levels are also seen occasionally with luteal ovarian cysts, molar pregnancies, and with a rare form of ovarian cancer.