Blood Tests Every Man Over 40 Should Get
From testosterone decline to cardiovascular risk, prostate health, and metabolic syndrome — men's health changes significantly after 40. Here is the complete blood test checklist with specific reference targets and clinical context.
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Cardiovascular disease risk begins accumulating silently in the 40s. Testosterone starts declining at roughly 1% per year from age 30–35. Metabolic syndrome prevalence surges. Blood pressure, blood glucose, and liver enzymes all trend upward with age and lifestyle exposure. Getting a comprehensive baseline at 40 establishes where you actually are — not where a lab reference range (set at the 2nd–98th percentile of whoever walked through the lab door) suggests you should be.
| Test | Why It Matters | Frequency |
|---|---|---|
| Full lipid panel + ApoB | LDL, HDL, triglycerides, and ApoB particle count — cardiovascular risk rises steeply after 40 | Annually |
| Fasting glucose and HbA1c | 30% of men have prediabetes, most undiagnosed | Every 1–3 years |
| Total and free testosterone | Hypogonadism affects 20–30% of men over 45 — symptoms include fatigue, reduced libido, body composition changes | Every 2 years or if symptomatic |
| TSH | Less common than in women but thyroid disease in men is frequently missed | Every 2–3 years |
| CBC (full blood count) | Rule out anaemia and blood count abnormalities | Annually |
| Liver enzymes (ALT/AST/GGT) | NAFLD affects 40% of men; alcohol effects; baseline for statin monitoring | Annually |
| eGFR and creatinine | Kidney function screen — CKD often asymptomatic until stage 3 | Every 2–3 years |
| PSA (prostate-specific antigen) | Prostate cancer screening — discuss with your doctor; guidelines recommend shared decision-making starting at 50 (45 if higher risk) | Per individual risk discussion |
| 25-OH Vitamin D | 42% of US men are deficient; impacts testosterone, immune function, mood | Annually |
Priority Tests for Men Over 40
Total vs Free Testosterone: What to Measure
Total testosterone (264–916 ng/dL) measures all circulating testosterone including protein-bound fractions that are biologically inactive. Free testosterone (the unbound, active fraction — approximately 2% of total) is more clinically relevant for symptoms, but is harder to measure accurately. SHBG (sex hormone binding globulin) increases with age and obesity, binding more testosterone and reducing the free fraction — so a man can have a "normal" total testosterone but significant symptoms due to low free testosterone. For men over 45, measuring total testosterone alongside SHBG and calculating free testosterone gives a complete picture.
Low Testosterone: More Common and More Impactful Than Most Men Realise
Testosterone declines ~1–2% per year from age 30. By 40–45, around 25% of men have clinically low levels. Symptoms — fatigue, reduced motivation, muscle loss, brain fog, low libido — are often attributed to age. Request total testosterone (morning draw, before 10 AM) and free testosterone or SHBG. If total T is above 350 ng/dL but symptoms persist, low free T from elevated SHBG is a common overlooked cause.
The Metabolic Cluster Most Men Have by 45
The combination of elevated fasting glucose, elevated triglycerides, low HDL, mildly elevated liver enzymes, and rising blood pressure is not a normal aging pattern — it is metabolic syndrome. It affects 40% of US men over 40. Importantly, it is reversible. The blood tests that track reversal are fasting insulin (and HOMA-IR), triglycerides, and ALT — all of which can normalise substantially within 8–12 weeks of consistent dietary modification and exercise.
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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