A health check at 40 for women should test perimenopause hormones, thyroid antibodies, cardiovascular risk, insulin sensitivity, and nutrient stores. The NHS Health Check tests cholesterol and blood sugar. A comprehensive private panel like the TrueVitals Ultimate covers 114 biomarkers across every system that changes in a woman's body from 40 onwards. That is the level of depth this moment in your life deserves.
Perimenopause typically starts around age 44, though it can begin in the late 30s. It lasts 4 to 8 years. Progesterone drops first as more cycles become anovulatory. Oestradiol fluctuates wildly. FSH begins rising. Symptoms include irregular cycles, hot flushes, mood changes, brain fog, insomnia, joint pain, and reduced libido. NICE NG23 tells GPs not to use FSH to diagnose perimenopause in women 45 and over. For women aged 40 to 45, an FSH test can support a suspected diagnosis. But most GPs rely on symptom reporting alone and offer no baseline hormonal data.
What to test: FSH, LH, oestradiol, progesterone, testosterone, SHBG, free testosterone, prolactin. This is the full hormonal baseline that tracks where you are in the perimenopausal transition and informs HRT decisions later. The TrueVitals Ultimate panel includes all of these.
Thyroid disorders are 5 to 8 times more common in women than men, and the 40s are when risk increases most steeply. Hashimoto's thyroiditis (the most common cause of hypothyroidism in the UK) can be detected years before TSH moves out of range by testing thyroid antibodies (Anti-TPO, Anti-Tg). Up to 20% of women over 60 have some degree of thyroid dysfunction. The process often begins at 40. The NHS tests TSH only and does not routinely test antibodies. Thyroid symptoms (fatigue, weight gain, brain fog, mood changes, hair thinning) are almost identical to perimenopause symptoms, which means one is frequently misattributed to the other.
What to test: TSH, Free T4, Free T3, Anti-TPO, Anti-Tg. The full thyroid panel catches autoimmune thyroid disease at its earliest, most treatable stage. The TrueVitals Ultimate panel includes the complete thyroid profile.
Before menopause, oestrogen provides significant cardiovascular protection: it maintains endothelial function, keeps LDL lower and HDL higher, and improves insulin sensitivity. As oestrogen declines through perimenopause, this protection diminishes. By 55, women's cardiovascular risk equals men's. Cardiovascular disease is the number one killer of women in the UK, accounting for more deaths than all cancers combined. Women who had excellent cholesterol at 35 may see significant shifts by 45.
Key markers: Total cholesterol, LDL, HDL, triglycerides, ApoB, Lp(a), homocysteine, hs-CRP. Standard cholesterol alone is not enough. ApoB and Lp(a) predict cardiovascular events more accurately.
Insulin sensitivity decreases with age and worsens as oestrogen declines. Perimenopause is a well-documented trigger for insulin resistance and weight redistribution (particularly to the abdomen). HbA1c catches late-stage problems. Fasting insulin and HOMA-IR detect the earlier metabolic shift while it's fully reversible. PCOS-related insulin resistance may also become more apparent or worsen during the perimenopausal transition.
Key markers: HbA1c, fasting glucose, fasting insulin, HOMA-IR, C-peptide. These catch insulin resistance years before a standard HbA1c-only test would flag anything.
Iron stores fluctuate with heavy perimenopause-related periods (some women experience significantly heavier bleeding). Vitamin D becomes critical for bone protection as oestrogen declines. B12 and folate affect mood, energy, and neurological function. Forth's 2025 UK data found 63.7% of women tested had ferritin outside the healthy range and approximately 33% had suboptimal B12. At 40, these deficiencies compound every other change happening simultaneously.
Key markers: Ferritin, transferrin saturation, serum iron, TIBC, vitamin D, B12, folate, zinc. These establish the nutrient baseline that informs targeted supplementation rather than guesswork.
The TrueVitals Ultimate panel covers perimenopause hormones, full thyroid with antibodies, advanced cardiovascular, metabolic depth, and nutrient stores. 114 biomarkers. Results in 48 hours. £349.
This is one of the most significant clinical problems for women at 40. Perimenopause and thyroid dysfunction produce nearly identical symptoms: fatigue, weight gain, brain fog, mood changes, hair thinning, irregular periods, cold sensitivity, poor sleep. They also frequently coexist. A woman can have early perimenopause AND Hashimoto's thyroiditis simultaneously, with each condition worsening the other.
Without blood testing, the attribution is a guess. Many women are told "it's probably perimenopause" when their thyroid is underactive. Others are told their thyroid is fine (based on a TSH-only test) when thyroid antibodies are elevated and the autoimmune process has already begun. The GP pathway does not separate these. A comprehensive panel does.
A comprehensive panel analyses both hormonal and thyroid markers simultaneously. AI cross-system analysis identifies which pattern is driving your symptoms. If FSH is rising and oestradiol is fluctuating alongside normal thyroid markers, it's perimenopause. If Anti-TPO antibodies are elevated alongside borderline Free T3, there's an autoimmune thyroid component. If both are present, the report flags it and recommends discussing both with your GP. This distinction is only possible with comprehensive testing that covers both systems in the same blood draw. Menopause blood test guide. Thyroid blood test guide.
Most blood test providers give you a dashboard with green, amber, and red dots. You see "ferritin: 28, in range" and move on. You don't know that 28 is technically in range but below the optimal threshold for energy and hair health. You don't know that your borderline ferritin, combined with low Free T3 and elevated Anti-TPO, is a pattern that explains exactly why you're tired and losing hair.
A good report does four things most providers skip:
Many women begin considering HRT in their mid to late 40s as perimenopause symptoms intensify. The most productive HRT conversation with your GP starts with data. Arriving with a comprehensive hormonal baseline, thyroid status, cardiovascular risk profile, and metabolic health picture allows your GP to prescribe with precision rather than protocol.
Testing at 40, before the most significant hormonal shifts occur, gives you the pre-perimenopause reference point. When you retest at 43 or 45 and symptoms have emerged, the comparison between your baseline and current values shows exactly what has changed and by how much. Your GP can see the trajectory, not just the snapshot. That is a fundamentally better foundation for treatment decisions.
A comprehensive panel covers every marker relevant to HRT decision-making: FSH, oestradiol, progesterone, testosterone, SHBG, thyroid function with antibodies, lipids, and metabolic markers. Test now. Retest when symptoms develop. Take both reports to your GP. The conversation will be different. Full menopause blood test guide.
114 biomarkers. Perimenopause hormones, thyroid antibodies, cardiovascular risk, metabolic health, and nutrients. AI-powered analysis. Medical review. Results in 48 hours. From £349.
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