Blood Tests Every Woman Over 40 Should Get
Hormonal shifts, rising cardiovascular risk, bone health, and thyroid changes all accelerate after 40. This is the complete blood test checklist for women in their 40s and 50s — with reference ranges and what to do with the results.
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Perimenopause typically begins in the mid-40s, but the metabolic changes start earlier. Cardiovascular risk begins rising, thyroid disease becomes more common, insulin sensitivity decreases, and bone loss accelerates. Getting a comprehensive baseline panel at 40 — and monitoring regularly afterward — catches these changes early enough to intervene effectively.
| Test | Why It Matters After 40 | Frequency |
|---|---|---|
| TSH | Thyroid disease affects 10–15% of women; hypothyroidism causes fatigue, weight gain, elevated cholesterol | Every 1–2 years |
| Full lipid panel | LDL rises as estrogen production falls in perimenopause | Annually |
| Fasting glucose and HbA1c | Insulin sensitivity declines; screen for prediabetes | Every 1–3 years |
| Full blood count (CBC) | Screen for anaemia, especially if still menstruating heavily | Annually |
| Ferritin | Iron deficiency is common in premenopausal women with heavy periods | Annually |
| 25-OH Vitamin D | Deficiency prevalent; protective for bone and immune health | Annually |
| FSH / estradiol | Confirm perimenopausal status if irregular periods or vasomotor symptoms | When symptoms arise |
| ANA screen | Autoimmune disease peaks in women 40–60; screen if unexplained fatigue, joint pain | If symptomatic |
| Cervical cancer / HPV screen | Women 30–65 should have cervical screening every 5 years (Pap + HPV co-test) | Every 5 years |
Priority Tests for Women Over 40
The Thyroid-Weight Connection
Hypothyroidism and perimenopause share many symptoms: fatigue, weight gain, mood changes, irregular periods, and brain fog. The conditions frequently co-occur. A normal TSH (0.4–4.0 mIU/L) effectively rules out clinical hypothyroidism. However, many integrative medicine providers suggest a tighter "optimal" range of 1.0–2.5 mIU/L, and some women report symptomatic improvement at the lower end. If TSH is in range but symptoms persist, free T4 and free T3 provide additional information.
Signs That Blood Tests Are Overdue in Women Over 40
The Ferritin Blind Spot
One of the most common missed diagnoses in women aged 40–50 is iron deficiency without anaemia. Ferritin below 30 ng/mL — even with a normal haemoglobin — can cause significant fatigue, hair loss, reduced exercise tolerance, restless legs, and cognitive fog. Many women spend years having these symptoms investigated without the most obvious cause — suboptimal ferritin — being correctly identified. Always ask for ferritin specifically; it is not included in a standard CBC.
Medical Disclaimer
This article is for educational purposes only and does not constitute medical advice. Reference ranges, supplement dosages, and nutritional information mentioned are general educational guidance from published research—not personalised recommendations. Do not use this content to self-diagnose or self-treat any condition. Always consult a qualified healthcare provider before making any changes to your health regimen, medications, or supplements.
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