Hormone Testing for Menopause

 Why is one test not enough?

During perimenopause, hormones such as estrogen fluctuate dramatically from day to day. Consequently, hormonal assessment can be challenging, as a single blood sample provides only a snapshot of a continuously changing hormonal environment.

For example, a woman may have FSH levels of 8 mIU/mL one week, but this same woman may have FSH levels that were 40 mIU/mL in the next week. Furthermore, estradiol concentrations may fluctuate substantially within a single menstrual cycle, often moving above and below typical reproductive ranges. So, if the doctor tells you that your hormone levels are normal based solely on one hormone level, this doesn’t rule out perimenopause.

What the science says about repeating tests

1) FSH & LH: – Test twice, 4-6 weeks apart

Menopause is primarily a clinical diagnosis based on 12 consecutive months of amenorrhoea. Elevated FSH levels may support the diagnosis but are not required in most women over 45 years of age.

2)Estradiol (E2): – Most useful as a pattern, not a point.

A single estradiol measurement is rarely diagnostic. Serial measurement over weeks reveals the erratic swings that characterize perimenopause.

3)AMH: – One reliable reading is enough.

AMH doesn’t fluctuate with the cycle or time of day, making it the most stable single test for ovarian reserve. A very low AMH can precede FSH changes by 2-5 years.

4) All together: – Symptoms and hormonal patterns are more informative than any single test results.

Clinicians use the STRAW + 10 staging system, which combines menstrual pattern changes, symptoms, and serial lab values – not a single test.

Best time in the menstrual cycle to test FSH & E2

Ø The baseline levels of FSH and E2 should be tested between days 2 and 5 after the start of menstruation.

– This is  when hormone concentrations are generally at their lowest and most comparable between individuals. Testing during the mid-cycle may result in transiently elevated estradiol or luteinising levels, making interpretation more difficult. 

Ø If you experience irregular menstrual cycles, you can test at any time; however, you should keep track of the date and phase of your cycle when doing so.

Ø There are no day restrictions associated with testing progesterone and AMH. AMH is independent of cycle day.

Ø Progesterone should be tested on day 21 of the menstrual cycle (mid-luteal phase) to determine if conclusive evidence of ovulation occurred; this test is separate from testing used for the purposes of menopause staging.

Testing in Singapore:-

Where to go: –

1) Raffles Women’s Centre (specialist gynae): – Bugis – full hormone panels, menopause consult, repeat testing.

SGD $180-350 incl. consult

2) Aster Gynaecology (specialist gynae): – Mt Elizabeth Novena – Dr. Ng Kai Lyn, special interest in women’s health and menopause management.

SGD $200-380 incl. consult

3) Ezra Clinic (specialist gynae): – Novena – female gynaecologist Dr. Michelle Chia, transparent pricing.

SGD $150-300 incl. consult

4) HOP Medical Centre (Health screening): – Orchard – add on hormone panels to any health screen package

SGD $80-180 incl. consult

5) ATA Medical Clinic (Health screening): – Tanjong Pagar – efficient screening, hormone add-ons available.

SGD $60-150 incl. consult

6) KK Women’s Hospital / SGH (Public hospital): –

Subsidized rates for Singapore citizens/PRs with GP referral.

SGD $30-80 incl. consult

What Panels to Request and Why

1) Essential baseline panel: – FSH, LH, Estradiol (E2), AMH – together, these four markers provide the clearest assessment of reproductive ageing and menopausal transition. Always ask for all four; ordering them separately costs more and misses the pattern.

2) Add if symptoms are complex: – Thyroid (TSH, free T4) dysfunction can closely mimic the symptoms of perimenopause (fatigue, weight shift, mood changes, irregular cycles). NICE guidance recommends ruling it out first. Add testosterone if low libido or fatigue is prominent.

3) Ask for a repeat test plan: – Request a second FSH/E2 test 4-6 weeks after the first, because a single result is not diagnostic.

4) Timing your appointment: – Book for days 2-5 of your period for the most comparable FSH and E2 baseline.

Test your doctor might miss: –

1) Thyroid Panel (TSH + Free T4)

Thyroid dysfunction wears the exact same mask as perimenopause

Fatigue, weight gain, mood swings, brain fog, hair loss, irregular periods, sleep problems – these are symptoms of both hypothyroidism and perimenopause. Without a thyroid test, you cannot tell them apart.

2) Vitamin D (25-Hydroxyvitamin D)

Vitamin D deficiency may exacerbate menopausal symptoms, and many women remain unaware of their deficiency status.

Vitamin D is not just a bone nutrient. It interacts with estrogen metabolism, affects serotonin (linked to hot flashes and mood), and influences sleep, joint pain, and cardiovascular risk – all of which worsen at menopause.

 3) Testosterone (total + free)

Testosterone plays an important physiological role in women; however, the evidence supporting routine and treatment remains limited.

Women produce testosterone in the ovaries and adrenal glands. It contributes to libido, energy, mood, and bone health. But the evidence for testing – and treating – is more specific than popular wellness content suggests.

Best Time to test fertility hormones: 

Day 2-5 of your period is the gold standard for FSH and estradiol

This early follicular window captures your baseline – the lowest and most stable hormone levels of the month. Mid-cycle, estradiol surges and LH spikes, making results impossible to interpret. AMH is the one exception: it stays flat all month, so no timing is needed.

Irregular periods in your 40s: –

Irregular cycles in your 40s are common, but they warrant appropriate evaluation and understanding.

The STRAW+10 framework defines early perimenopause as cycles that vary by 7+ days. Late perimenopause begins when you skip 2 or more cycles. This fluctuation happens because the ovaries respond less reliably to FSH – follicles develop unevenly, estradiol levels may fluctuate substantially, and ovulation becomes inconsistent.

1) Cycle varies by ≥ 7 days: – Early perimenopause

Track your cycle length for 3 months and bring the data to your clinician.

2) Skipping 2+ consecutive cycles: – late perimenopause

This is the strongest clinical signal to begin hormone testing and monitoring.

3) Heavy or very frequent bleeding is not normal – see a doctor

Irregular ≠ heavy. Fibroids, polyps, or endometrial changes can co-occur with perimenopause and need assessment.

Frequently Asked Questions

References:

1. Anagnostis, P., Livadas, S., Goulis, D. G., Bretz, S., Ceausu, I., Durmusoglu, F., Erkkola, R., Fistonic, I., Gambacciani, M., Geukes, M., Hamoda, H., Hartley, C., Hirschberg, A. L., Meczekalski, B., Mendoza, N., Mueck, A., Smetnik, A., Stute, P., van Trotsenburg, M., … Lambrinoudaki, I. (2023). EMAS position statement: Vitamin D and menopausal health. Maturitas, 169, 2–9. https://doi.org/10.1016/j.maturitas.2022.12.006
2. European Society of Endocrinology clinical practice guideline for evaluation and management of menopause and the perimenopause | European Journal of Endocrinology | Oxford Academic. (n.d.). Retrieved 19 June 2026, from https://academic.oup.com/ejendo/article/193/4/G49/8281862
3. Harlow, S. D., Gass, M., Hall, J. E., Lobo, R., Maki, P., Rebar, R. W., Sherman, S., Sluss, P. M., de Villiers, T. J., & STRAW + 10 Collaborative Group. (2012). Executive summary of the Stages of Reproductive Aging Workshop + 10: Addressing the unfinished agenda of staging reproductive aging. The Journal of Clinical Endocrinology and Metabolism, 97(4), 1159–1168. https://doi.org/10.1210/jc.2011-3362
4. Islam, R. M., Bond, M., Ghalebeigi, A., Wang, Y., Walker-Bone, K., & Davis, S. R. (2025). Prevalence and severity of symptoms across the menopause transition: Cross-sectional findings from the Australian Women’s Midlife Years (AMY) Study. The Lancet Diabetes & Endocrinology, 13(9), 765–776. https://doi.org/10.1016/S2213-8587(25)00138-X
5. Lumsden, M. A., Davies, M., Sarri, G., & Guideline Development Group for Menopause: Diagnosis and Management (NICE Clinical Guideline No. 23). (2016). Diagnosis and Management of Menopause: The National Institute of Health and Care Excellence (NICE) Guideline. JAMA Internal Medicine, 176(8), 1205–1206. https://doi.org/10.1001/jamainternmed.2016.2761
6. Pyne, Y., Burgin, J., & Hickey, M. (2024). Towards a more accurate global picture of perimenopause. Bulletin of the World Health Organization, 102(12), 922–924. https://doi.org/10.2471/BLT.24.292659
7. Reisel, D., Crockett, C., Glynne, S., Kamal, A., & Newson, L. (2024). Prevalence of Cognitive and Mood-Related Symptoms in a Large Cohort of Perimenopausal and Menopausal Women. BJPsych Open, 10(Suppl 1), S204–S205. https://doi.org/10.1192/bjo.2024.497

Anna Haotanto

Anna Haotanto is the Founder of Zora Health and a passionate advocate for women’s empowerment. Anna’s personal experiences with egg-freezing, PCOS, perimenopause and the challenges of fertility have fueled her mission to provide high-quality information, financing, and support to help women and couples navigate their fertility journeys with confidence. She is also recognised for her achievements in finance, entrepreneurship, and women’s empowerment, and has been featured in various media outlets. You can also follow her on Linkedin or Instagram.