Routine blood tests can check anywhere from a handful to over a hundred different markers. But if you had to pick just five — the ones that give you the clearest window into your long-term health — which would they be?
Here are the five biomarkers that health-conscious people most benefit from tracking regularly, and why each one matters more than most people realise.
Why These Five?
Not all biomarkers are created equal. Some are highly specific to a single condition; others are broad indicators of underlying health. The five below sit at the intersection of high impact (they're linked to major disease risks), high actionability (your lifestyle choices genuinely move these numbers), and broad applicability (they matter for almost everyone, regardless of age or existing conditions).
The Biomarkers
1. HbA1c (Glycated Haemoglobin) — This measures your average blood sugar over the past three months. Unlike a fasting glucose test (a single moment in time), HbA1c gives you a running average. A value below 5.7% is considered normal. Between 5.7–6.4% signals prediabetes — a reversible window. Above 6.5% is diabetic range. Tracking this annually catches insulin resistance early, when diet and exercise alone can reverse the trend.
2. LDL Cholesterol — Low-density lipoprotein is the primary driver of arterial plaque. Chronically elevated LDL significantly raises the risk of heart disease and stroke — the world's top killers. Target: under 100 mg/dL for most healthy adults. It’s strongly influenced by diet (saturated fat, trans fat, dietary cholesterol) and responds well to lifestyle changes within 8–12 weeks.
3. Ferritin — Iron stores. This is the marker most commonly missed. People can have ‘normal’ haemoglobin but critically low ferritin — causing persistent fatigue, poor concentration, hair thinning, and breathlessness. Women, vegetarians, and frequent blood donors are especially at risk. Target: 50–150 ng/mL for optimal function, not just the lab's minimum of 12.
4. Vitamin D (25-OH) — This fat-soluble vitamin acts more like a hormone, influencing immune function, bone density, mood regulation, and muscle strength. Deficiency is pandemic — over 70% of Indians and large proportions of people in northern latitudes are deficient. Optimal range: 40–60 ng/mL. Sun exposure alone is rarely enough; supplementation is often necessary.
5. TSH (Thyroid Stimulating Hormone) — The thyroid controls your metabolic rate, energy levels, temperature regulation, and mood. TSH is the pituitary’s signal to the thyroid. High TSH suggests an underactive thyroid (hypothyroidism); low TSH suggests overactivity. Optimal TSH sits between 1.0 and 2.5 mIU/L — though many labs use a wider range of 0.4–4.0 as ‘normal’.
How to Track Them
Ideally, get a baseline reading for all five right now — even if you feel fine. Schedule a recheck every 6–12 months, or sooner if you're making targeted changes. Upload each result to VitalsGraph to see your trends at a glance and get AI-powered context for every value.
Knowing your numbers isn’t just for people who are sick. It’s how healthy people stay healthy.
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