Ovarian failure is indicated by consistently raised FSH levels - over 30IU/l - together with raised LH and low serum oestradiol levels (1).
If a woman has symptoms typical of the menopause and has a slightly irregular menstrual cycle, then a raised FSH in the early follicular phase may indicate the perimenopause, and it is likely that the patient will become menopausal during the next five years.
NICE state (2):
Reference:
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