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.

How to Prepare for the Test

To get reliable data, preparation is crucial:

• Fasting: At least 12 hours. Water only.
• No Alcohol: Avoid alcohol for 24-48 hours before the test, as it can alter triglycerides and liver enzymes.
• Training: Avoid intense workouts the day before. Heavy exercise can temporarily raise transaminases (AST/ALT) and creatinine, leading to false kidney or liver alarms.
• Hydration: Drink water on the morning of the test. Dehydration can concentrate the blood and skew results.

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. Low fasting insulin indicates your pancreas doesn't have to "scream" to keep sugar in check.
  • 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. Advanced Cardiovascular Health

Total cholesterol tells us little. To understand true atherosclerotic risk, we need to go deeper.

• ApoB (Apolipoprotein B): Measures the total number of atherogenic particles (LDL, VLDL, IDL). It is a much more accurate risk predictor than LDL-C (cholesterol concentration).
  • Longevity Target: < 80 mg/dL (or < 60 mg/dL for high risk).
• Homocysteine: An amino acid that, if elevated, damages artery walls and increases the risk of thrombosis and dementia. Often indicates a Vitamin B deficiency or methylation issues (MTHFR gene).
  • Longevity Target: < 10 µmol/L.

3. 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. Measures minimal systemic inflammation.
  • Longevity Target: < 1.0 mg/L (ideally < 0.5).

4. Liver and Kidney Health

The liver is the body's filter. If it's clogged (fatty liver), the whole system suffers.

• GGT (Gamma-GT): The most sensitive indicator of liver stress and oxidative damage. It is also correlated with all-cause mortality.
  • Longevity Target: < 20 U/L (men), < 15 U/L (women).
• ALT (Alanine Aminotransferase): Lab ranges often go up to 40-50, but studies show risk increases above 30.
  • Longevity Target: < 30 U/L.

5. 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 and hair loss; too high = inflammation and oxidative organ damage.
  • Longevity Target: 50-150 ng/mL.
• Vitamin B12 and Folate: Essential for DNA synthesis and nerve health. Low "normal" values can already cause neurological symptoms.

6. Hormonal Health

Crucial especially in menopause and andropause, the hormonal panel reveals a lot about the quality of aging.

• Testosterone (Total and Free): Fundamental for men and women for muscle mass, bone density, and brain vitality.
• Full Thyroid Panel (TSH, fT3, fT4, antibodies): TSH alone is often not enough. Antibodies (TPO, TG) can reveal autoimmune thyroiditis (Hashimoto's) years before TSH goes out of range.

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.