Is there a test for perimenopause? What works and what does not

Why a blood test does not settle it

The usual test is FSH, follicle stimulating hormone. As the ovaries wind down, the brain produces more FSH trying to stimulate them, so a high FSH reading suggests ovarian function is declining.

The problem is timing. In perimenopause, hormone levels swing dramatically from day to day and week to week. FSH can be high one week and entirely normal the next, in the same woman, during the same transition.

So a normal result does not rule perimenopause out, and a raised result on its own does not confirm it. You can be firmly perimenopausal and test normal on the day you happened to have blood taken.

What UK guidance actually says

NICE guidance is that in women over 45 with typical symptoms, menopause and perimenopause should be diagnosed without laboratory tests.

FSH testing has a defined role in narrower circumstances: in women aged 40 to 45 with menopausal symptoms including a change in cycle, and in women under 40 where premature ovarian insufficiency is suspected. Under 40, testing matters and is usually repeated.

There is also a practical point. Hormonal contraception affects the picture, and FSH is not interpretable in the usual way while some methods are in use.

Home test kits

At-home menopause and perimenopause kits generally measure FSH in urine or blood. They are subject to exactly the same limitation as a test done at a surgery: they capture one moment in a process defined by its variability.

A kit can tell you what your FSH was on Tuesday. It cannot tell you whether you are in perimenopause, and it cannot tell you whether treatment is appropriate for you.

They are not dangerous and they are not a scam. They are just answering a question that is not the one you are asking.

What actually establishes it

A careful history. Specifically:

• What your cycle is doing now compared with a year ago
• Which symptoms you have
• How severe they are and how much of your life they are taking
• How long they have been there
• What else could explain them, including thyroid problems, anaemia and other conditions that overlap

That last point is the real clinical value of an assessment. Ruling out other causes matters more than confirming this one.

When blood tests are worth doing

Not to diagnose perimenopause over 45, but for other reasons:

• Suspected premature ovarian insufficiency under 40
• Symptoms between 40 and 45 with cycle change
• Ruling out thyroid disease or anaemia, which mimic several symptoms
• Investigating abnormal bleeding
• Before and during treatment with certain hormones where levels guide dosing

What we do

Our assessment is free and takes about five minutes. It uses a validated symptom scale, records severity rather than just presence, takes a full medical history, and screens for the safety questions that decide whether treatment is appropriate.

That is what a prescriber reads. It is not a test result, and it is more useful than one.