Is there a blood test for perimenopause?

If you are 45 or older and experiencing early signs of perimenopause — such as shifting cycles alongside new hot flashes or night sweats — clinical guidelines state that you usually do not need a hormone blood test to confirm perimenopause.

What NICE guideline NG23 advises at age 45 and over

In the UK, NICE guideline NG23 (Recommendations 1.3.1 and 1.3.4) gives explicit instructions on laboratory testing:

• Identify without hormone blood tests at 45+: In otherwise healthy people aged 45 or over, perimenopause is identified clinically when vasomotor symptoms have recently started together with a change in menstrual cycles.
• Tests not to use at 45+: Do not use anti-Müllerian hormone (AMH), inhibin A or B, oestradiol, antral follicle count, or ovarian volume to identify perimenopause or menopause in this age group.

Because ovarian hormone production fluctuates erratically during the menopausal transition, a single estradiol or FSH draw can look completely normal one week and elevated the next. Note that a clinician may still order other blood tests (such as thyroid function or iron studies) to rule out non-menopausal causes of fatigue, heavy bleeding, or mood changes.

When hormone blood tests are needed (under age 45)

Age changes the testing rule:

• Under age 40: If you have irregular or absent periods or menopausal symptoms before 40, blood tests are essential to assess for premature ovarian insufficiency (POI).
• Ages 40 to 44: When menopause-like symptoms begin between 40 and 44, clinicians may consider targeted testing alongside a full review of other possible causes.

What to bring instead of a commercial test kit

Skip unverified over-the-counter tests or supplement kits. Instead, use our STRAW+10 perimenopause stage guide and bring two to four weeks of entries from your private symptom tracker to your appointment.