Your appointment
How perimenopause is diagnosed
What you need to know to participate effectively in that conversation
Many women who are experiencing perimenopause symptoms come away from their first appointment without a clear explanation for what is happening. They may have been told to "wait and see," offered a blood test that came back normal, or given a different diagnosis entirely.
This is not simply a matter of individual doctors missing something. It reflects a genuine complexity in how perimenopause is diagnosed — and a significant gap between what current guidelines actually recommend and what happens in many routine consultations.
Current guidelines from the European Society of Endocrinology, NICE, and other major bodies are explicit: in women aged 45 and over with typical symptoms and menstrual changes, perimenopause can and should be diagnosed from the clinical history alone. Routine blood tests are not recommended as part of the standard diagnostic process for this age group. If a blood test has come back "normal" and you have been told you are not in perimenopause, that conclusion may not be correct. A single normal FSH or oestradiol result does not rule out perimenopause.
FSH and oestradiol are the tests most commonly ordered when perimenopause is suspected. In theory, these changes should be detectable by a blood test. In practice, the problem is that perimenopause is a period of extreme hormonal fluctuation, not a steady decline. Hormone levels change dramatically from day to day, week to week, and cycle to cycle. A blood test taken on one day captures a single snapshot of this fluctuating system. That snapshot may show levels that look premenopausal, even in a woman who is significantly symptomatic. A normal FSH test does not mean your hormones are normal.
This is the core of the diagnosis. Your doctor should ask about changes to your menstrual cycle — when they started, what has changed — and about symptoms across multiple domains: vasomotor symptoms, sleep, mood, cognition, physical symptoms, intimate health.
Several conditions produce symptoms that overlap with perimenopause: thyroid dysfunction, depression, anxiety, iron deficiency, and others. A responsible diagnostic process considers these, particularly in younger women or in women whose symptom pattern is atypical.
Not routinely required for women 45 and over. May be useful for women 40–44. Should be taken on two separate occasions if ordered. Essential for women under 40, where premature ovarian insufficiency (POI) needs to be considered.
A standard GP appointment is ten minutes. Perimenopause has up to eight symptom domains, each of which can be significant. A woman who mentions one or two symptoms in a brief appointment may receive a partial assessment.
Women are frequently told their FSH is "normal" and therefore they are not in perimenopause. As described above, this contradicts current guidelines. The test is not a reliable exclusion tool.
Research consistently documents that women are told their perimenopausal symptoms are stress, anxiety, depression, or simply age. This reflects both the overlap between perimenopause symptoms and other conditions, and an enduring gap in how perimenopause is recognised in primary care.
Women in their early 40s may be told they are too young. Women in their late 40s may be told it's simply "to be expected." Neither response constitutes a proper assessment.
Current clinical guidelines support you in asking, explicitly, for the following:
- —
Whether your symptoms and cycle changes are consistent with the perimenopause transition, based on your clinical history.
- —
If blood tests are offered, what they are expected to show and what a normal result would and would not mean in your specific case.
- —
If you are under 45 and symptoms are significant, whether premature ovarian insufficiency has been considered and what the appropriate assessment would be.
- —
If you have been assessed previously and told you are not in perimenopause based on a blood test, whether that assessment is consistent with current guidelines.
The diagnostic conversation depends on information your doctor cannot access without you. The Thea Klara appointment summary brings that information into the consultation in structured form — symptoms across all eight domains, rated by how often they occur and how much they affect you.
Prepare your visit →149 kr · one-time payment · instant download
European Society of Endocrinology. Clinical practice guideline for evaluation and management of menopause. Eur J Endocrinol. 2025.
Harlow SD et al. STRAW+10: Addressing the unfinished agenda of staging reproductive aging. Climacteric. 2012.
NICE guideline NG23: Menopause: diagnosis and management. Updated 2019.
StatPearls. Menopause. NBK507826. Updated 2024.
BMJ perimenopause clinical overview. BMJ. 2023.
Thea Klara provides self-advocacy tools, not medical advice. This content has been written to help you understand and describe your experience. It is not a substitute for a conversation with a qualified healthcare professional.