Estradiol is the main form of estrogen produced by the follicles. FSH stimulates the ovaries to produce the follicle. A high FSH level (generally over 11) suggests that the follicles are not responding as well as they should be to FSH stimulation. Low Estradiol levels, particularly when associated with a high FSH level, suggest menopause. LH is also important for ovulation and, in conjunction with FSH, helps evaluate the efficacy of ovulation. A consistently high LH level is suggestive of menopause.