Many people expect a blood test to confirm perimenopause. For most people aged 45 or over, it isn’t needed. The UK’s NICE guideline says perimenopause and menopause can be identified without laboratory tests in otherwise healthy people aged 45 or over who have menopause symptoms.
Perimenopause is identified from hot flashes or night sweats that started recently, together with changes in the menstrual cycle. Menopause is identified after at least 12 months without a period, in people who are not using hormonal contraception.
Why not simply test? During perimenopause, hormone levels can rise and fall from one week to the next, so a single result can look normal even when symptoms are clearly there. A clear picture of your symptoms and your cycle over time often tells your clinician more.
Quick answers
When might a blood test be used?
NICE suggests considering an FSH (follicle-stimulating hormone) test only in people aged 40 to 45 with menopause symptoms, including a change in their cycle, and in people under 40 when menopause is suspected. Under 40, doctors check for premature ovarian insufficiency, which needs its own assessment.
Which tests does NICE advise against?
For people aged 45 or over, NICE advises against using anti-Müllerian hormone, inhibin A, inhibin B, estradiol, antral follicle count or ovarian volume to identify perimenopause or menopause.
What about home test kits?
Many home kits measure FSH in urine. Because levels can swing during perimenopause, a single result can’t confirm or rule it out. If you use one, talk to a clinician about what the result means for you.
Can something else cause similar symptoms?
Yes. Thyroid problems, for example, can cause sweating, a racing heart, tiredness and mood changes. If something doesn’t fit, your clinician may order tests to rule out other causes, which is different from testing to confirm menopause.
When to talk to a clinician
- Your symptoms started, or your periods stopped or became irregular, before 45 (especially before 40).
- You have any bleeding after 12 months without a period.
- Symptoms are affecting your sleep, work or mood.
- You are not sure whether you still need contraception.
How logging helps
Because the answer usually rests on your symptoms and your cycle, a few weeks of notes are often more useful than a single test. Pausa records hot flashes, sleep and mood on your iPhone and can turn them into a summary to show your clinician.
Source links updated in October 2026. Editorial policy →
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