Which blood biomarkers actually matter for longevity?

Short answer: focus first on markers of cardiovascular health, metabolic (glucose/insulin) control, systemic inflammation, kidney/liver function, key hormones and micronutrients, and (optionally) advanced aging assays (NMR metabolomics, ApoB/LDL‑particle, epigenetic clocks). Those categories predict most of the disease burden that shortens lifespan and are actionable.

What matters (prioritized)

• Lipids and atherogenic particle burden

  • Tests: LDL‑C, HDL, triglycerides, ApoB, LDL‑particle number (LDL‑P) or NMR LipoProfile, Lp(a)
  • Why: cardiovascular disease is the biggest driver of mortality; ApoB and LDL‑P often predict risk better than LDL‑C alone. Lp(a) is an independent genetic risk factor.
  • Rough targets: LDL‑C <100 mg/dL for general prevention; <70 mg/dL if high risk. ApoB <80 mg/dL desirable. Lp(a) <50 mg/dL (or <125 nmol/L).

• Glycemic control / insulin resistance

  • Tests: fasting glucose, fasting insulin, HbA1c, HOMA‑IR (from glucose + insulin)
  • Why: diabetes and insulin resistance accelerate vascular disease, cancer risk, and functional decline.
  • Targets: fasting glucose <100 mg/dL, HbA1c <5.7% (optimal individualized — lower within normal range is better without hypoglycemia). Keep fasting insulin low (many aim <8–10 μU/mL).

• Systemic inflammation

  • Tests: hs‑CRP, optionally IL‑6 or GlycA (NMR)
  • Why: chronic low‑grade inflammation predicts frailty, CVD, dementia and mortality.
  • Targets: hs‑CRP <1 mg/L best; 1–3 mg/L moderate; >3 high.

• Kidney and liver function

  • Tests: serum creatinine + eGFR, cystatin C (optional), urine albumin:creatinine ratio; ALT/AST, GGT, bilirubin
  • Why: kidney/liver dysfunction shorten healthy lifespan and influence medication choice.
  • Targets: eGFR >60 (ideally >90), ACR <30 mg/g, low/normal transaminases.

• Hematology and iron

  • Tests: CBC (hemoglobin, hematocrit, RDW), ferritin, transferrin saturation
  • Why: anemia and high RDW predict morbidity; iron overload (high ferritin/transferrin sat) links to worse outcomes in some studies.
  • Targets: hemoglobin in normal range; avoid very high ferritin (context dependent).

• Hormones relevant to aging and function

  • Tests: total/free testosterone (men), estradiol (women, as indicated), SHBG, IGF‑1 (contextual)
  • Why: maintain muscle, bone, function; extremes (too low or too high) have risks.
  • Targets: keep in normal, age‑appropriate ranges and treat symptoms, not numbers alone.

• Micronutrients and lifestyle biomarkers

  • Tests: 25‑OH vitamin D, B12, folate, magnesium (if indicated), Omega‑3 index
  • Why: deficiencies impair health; higher omega‑3 index associates with lower mortality.
  • Targets: vitamin D 25‑OH ~30–50 ng/mL; omega‑3 index >8% optimal.

• Markers of cardiac stress

  • Tests: NT‑proBNP (useful if cardiac disease suspected)
  • Why: predicts heart failure and mortality.

Optional/advanced tests (good if you want deeper risk profiling)

• NMR metabolomics (GlycA, lipoprotein particle sizes) — Nightingale Health or LabCorp NMR LipoProfile.
• ApoB/LDL‑P (if available) — LabCorp/Quest offer or NMR.
• Epigenetic clocks / DNA methylation biological age — TruDiagnostic is a major provider; gives a “biological age” estimate (useful for tracking interventions but still emerging).
• Telomere length tests and some specialty nutrient panels (SpectraCell) — interpret cautiously; not yet definitive for actionable clinical decisions.

Practical testing sources and why

• LabCorp and Quest Diagnostics — wide test menus, physician‑ordered, include ApoB, advanced lipid panels, and routine labs.
• InsideTracker (or WellnessFX / WellnessFX merged offerings) — good if you want interpretation + personalized lifestyle recommendations based on labs; can order labs through them or upload LabCorp/Quest results.
• OmegaQuant — clinically validated Omega‑3 Index testing.
• TruDiagnostic — one of the more established epigenetic clock (DNA methylation age) services if you want a molecular aging metric.
• Nightingale Health (Europe) / LabCorp NMR LipoProfile — for NMR metabolomics and GlycA (inflammation + lipoprotein particle details).
• Everlywell / LetsGetChecked — direct‑to‑consumer home kits for some basic tests (convenient but limited panels; follow up with clinician for interpretation).

What to do with the results (brief)

• If lipids are high → lifestyle first (diet, exercise, weight loss, smoking cessation); statin therapy under physician guidance if still elevated or high calculated risk.
• If glucose/insulin elevated → weight loss, carb quality control, regular exercise; consider metformin for prediabetes only with clinician discussion.
• If hs‑CRP elevated → search for causes (obesity, infections, periodontitis), improve sleep/activity/diet; consider anti‑inflammatory strategies under guidance.
• Correct vitamin D / B12 deficiency, raise omega‑3 index with fatty fish or fish oil if low.
• Manage high ferritin/transferrin saturation (evaluate for hemochromatosis; phlebotomy if indicated).

Testing cadence

• Baseline full panel annually for most healthy adults; more often (every 3–6 months) if you’re changing meds, treating abnormal results, or using aggressive interventions.
• Advanced/epigenetic tests: every 6–12 months if used to track interventions (they can be more expensive).

Caveats

• Individualization matters: targets depend on age, sex, clinical history and personal risk. For example, very low LDL in very old people may not always be appropriate without context.
• Some advanced biomarkers (telomere length, epigenetic clocks) are informative but still emerging — don’t base major medical decisions on them alone.
• Genetic markers (e.g., Lp(a)) are largely nonmodifiable; they change how aggressively you manage modifiable risks.

If you want, tell me:

• your age, sex, major medical history, and whether you’re already on meds (statin, metformin, etc.), and I’ll give a focused list of the highest‑priority labs for you and target ranges to aim for.