Why does the luteal phase frequently shorten in women over 35?

💡 Explanation

Decreasing ovarian reserve leads to fewer follicles producing estrogen, which is crucial for maintaining FSH levels and sustaining the corpus luteum in the luteal phase, because the negative feedback loop is disrupted, and FSH declines. Therefore, luteal phase shortens, rather than being affected primarily by local prostaglandin or inhibin.

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