The human corpus luteum, a temporary endocrine gland derived from the ovulated follicle, is a major source of steroid hormones, producing up to 40 mg of progesterone per day. (1) It is abruptly formed from the remnants of the preovulatory follicle, and it undergoes continuous change and studied as early, middle, and late luteal phases in ovulatory cycle. (2) The pattern of progesterone production throughout the luteal phase determines menstrual cyclicity & endometrial receptivity for successful

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... implantation , and is essential for maintenance of early pregnancy .(1) The breach in the mechanism leads to endometrial & corpus luteal disparity.