Blood Work for Longevity: The Complete Guide to Biomarkers

The standard annual check-up is designed for one thing: diagnosing existing diseases. If your values aren't "out of range" (often very wide ranges), you're told "everything is fine".

But for longevity, "normal" isn't enough. We want "optimal".

Here are the biomarkers you should request to get a real picture of your metabolic and cellular health.

1. Metabolic Health - The Engine

Metabolism is the foundation of everything. If this doesn't work, the rest crumbles. The secret to boosting this engine is zone 2 exercise. The key markers for metabolic health are:

• Glycated Hemoglobin (HbA1c): Key indicator of insulin resistance, measures average blood sugar over the last 3 months.
  • Longevity Target: < 5.4% (below 5.0% is excellent).
• Fasting Insulin: Often ignored (but crucial for evaluating intermittent fasting), but rises years before blood sugar.
  • Longevity Target: < 5 uIU/mL.
• Triglycerides/HDL Ratio: A powerful predictor of cardiovascular risk (along with HRV and RHR).
  • Longevity Target: < 1.0 (if triglycerides are lower than HDL, you're in great shape).

2. Inflammation - The Hidden Fire

Chronic low-grade inflammation ("inflammaging") is at the root of almost all aging diseases, often caused by ultra-processed foods.

• High-Sensitivity C-Reactive Protein (hs-CRP): Not standard CRP.
  • Longevity Target: < 1.0 mg/L (ideally < 0.5).

3. Key Nutrients

• Vitamin D (25-OH): Actually a hormone (also modulated by light exposure), crucial for immunity and bones.
  • Longevity Target: 40-60 ng/mL.
• Ferritin: Iron stores. Too low = fatigue; too high = inflammation/oxidative damage.
• Vitamin B12 and Folate: Essential for methylation and DNA.

4. Hormonal Health - Optional but Recommended

• Testosterone (Total and Free): Fundamental for men and women for muscle mass and vitality.
• Full Thyroid Panel (TSH, fT3, fT4, antibodies): TSH alone is often not enough.

You are not a number

Remember: a single value out of place is not a diagnosis. It's a signal. The goal is to look at trends over time. If your HbA1c goes from 4.8 to 5.2 in a year, even if it's still "normal", something is wrong with your lifestyle. Intervene now, not when it hits 6.0.