The clearest sign you are in perimenopause is a change in your periods, which become irregular, closer together, further apart, lighter or heavier, usually in your forties, alongside new symptoms like hot flushes, broken sleep or mood changes.
Perimenopause is diagnosed mainly on your symptoms and age, not a blood test, because hormones fluctuate so wildly day to day that a single test often cannot confirm it and can even mislead. The telltale cluster is changing cycles plus some combination of:
You can be perimenopausal while still having fairly regular periods, but a change in your cycle is the most reliable anchor. If you are in your forties and several of these ring true, perimenopause is the most likely explanation, and you do not need to wait for a blood test or for periods to stop to seek help. The reason a quiz or symptom log beats a one-off blood test is the hormonal chaos of this phase: oestrogen can be high one week and low the next, so the pattern over time tells you far more than any single number, which is also why two tests a fortnight apart can disagree completely.
There is one exception to the no-blood-test rule. Under 45, and especially under 40, a doctor may check FSH and other hormones, because confirming an earlier-than-usual transition changes how actively it is treated. Over 45 with classic symptoms, testing rarely adds anything the pattern has not already told you.
What to do: track your cycle and symptoms for a couple of months, since a pattern is worth more than any one-off reading. Take our free hormone quiz to see how your symptoms map to the hormonal picture, then take that to your GP, who can confirm the stage and talk through options, from lifestyle to HRT. If you are under 45 with these symptoms, mention it specifically, since earlier transitions deserve a closer look, as covered in at what age menopause starts.
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