Menopause is the medical term for our final menstrual period. If you are over the age of 50 and have had not had a menstrual bleed for more than 12 months, this is termed “postmenopausal”.
This loss of regular bleeding happens when the ovaries stop producing an egg every month (ovulation) and stop producing a hormone called Oestrogen, as they did before.
Typically, this happens due to a normal ageing process in the ovaries and the average age to have your final period is approximately 50 or 51.
For some women, they lose their ovarian function at an earlier age. This can happen for no obvious reason and may be due to genetics. For others, it may happen because of other causes such as after chemotherapy or other types of medical intervention.
Perimenopause is the term for the time leading up to the final period. During this time, the ovaries are still producing Oestrogen and may still be ovulating but in a less regular pattern. The Oestrogen production may be variable and less regular. Many women start to notice a change in their symptoms or how regular their periods are from the age of 45 or earlier.
Blood tests are not useful to “diagnose” perimenopause as the hormones fluctuate so much.