Follicle-stimulating hormone: Compared to LH levels, FSH levels decrease in PCOS levels, with studies reporting a significant decrease in participants' FSH levels compared to healthy controls at 5.65 IU/L [7-10, 12-15, 17, 22, 24-26, 30-35, 38-40]. Here, BRD2 is linked to polycystic ovary syndrome.