Perimenopause Symptoms and Testing: When to Investigate
Perimenopause can start in your late 30s. Hormone levels fluctuate wildly, so blood tests often miss it — the diagnosis is clinical.
The wide range of symptoms
Cycle changes (shorter or longer, heavier or lighter), night sweats, hot flashes, insomnia, mood swings and new anxiety, brain fog, joint aches, worsening PMS, weight gain around the midsection, vaginal dryness, and libido changes. Symptoms often appear 4–8 years before the final menstrual period.
Why testing is limited
FSH and estradiol fluctuate day to day in perimenopause — a normal value one week does not mean normal the next. Tests are useful to rule out other causes (thyroid dysfunction, prolactinoma, iron deficiency) rather than to prove perimenopause.
The diagnosis is clinical: cycle changes plus symptoms plus age in the 40s. AMH can indicate ovarian reserve and give a rough timeline in some contexts.
Treatment options
Hormone therapy (often lower-dose estradiol plus cyclic micronized progesterone), low-dose SSRI/SNRI for vasomotor symptoms in patients who cannot or prefer not to use hormones, cognitive behavioural therapy for insomnia, and lifestyle optimization (strength training, sleep hygiene, alcohol reduction).
Book a perimenopause consultation
Ready to discuss hormone therapy? Book an initial hormone therapy consultation or a perimenopause / menopause appointment, or contact us via our booking page.
Frequently asked questions
Can I have perimenopause in my 30s?+
Yes — early perimenopause is possible in the late 30s; earlier changes may indicate premature ovarian insufficiency and warrant workup.
Does hormone therapy still work if I am still cycling?+
Yes — regimens are adjusted to work alongside residual ovarian activity.