📖 Luteal Phase

In Detail

After ovulation, the corpus luteum produces progesterone, which thickens the uterine lining for potential implantation. A luteal phase shorter than 10 days (luteal phase defect) may not provide enough time for implantation, potentially causing infertility or early miscarriage. The luteal phase length is relatively consistent for each individual (±1 day) even when cycle length varies. BBT remains elevated during the luteal phase. If no pregnancy occurs, the corpus luteum degenerates, progesterone drops, and menstruation begins.