LifeLength

Short answer first: the most useful blood biomarkers for longevity are those that reflect metabolic health (glucose/insulin control), cardiovascular risk (ApoB/LDL‑particle number, Lp(a)), inflammation (hs‑CRP, IL‑6), kidney/liver function, hematologic health (hemoglobin, RDW), micronutrient and hormonal status (vitamin D, ferritin, testosterone/estradiol/TSH), and — for biological‑age estimation — epigenetic clocks or telomere/glycan age tests. Track a panel of these over time (trends matter more than a single reading). Below are the specific biomarkers I recommend, why they matter, and practical testing providers. High‑priority biomarkers (most strongly linked to longevity) HbA1c, fasting glucose, fasting insulin (or HOMA‑IR) Why: Chronic hyperglycemia and insulin resistance are powerful drivers of age‑related disease and mortality. Where to test: Quest Diagnostics or Labcorp (standard labs). For at‑home convenience: LetsGetChecked or Everlywell (limited panels). ApoB and/or LDL‑particle number (LDL‑P) Why: ApoB or LDL‑P better predict atherosclerotic cardiovascular risk than LDL‑C alone. Where to test: Labcorp NMR LipoProfile (via LipoScience) or Quest/Cardio IQ advanced lipid panels. Lipoprotein(a) [Lp(a)] Why: Genetic risk factor for early atherosclerosis that’s independent of other lipids. Where to test: Quest or LabCorp (standard specialty panels). High‑sensitivity CRP (hs‑CRP) and IL‑6 (inflammation) Why: Chronic systemic inflammation (“inflammaging”) predicts mortality and multiple age‑related diseases. Where to test: hs‑CRP is routine at Quest/LabCorp; IL‑6 is available as a specialty test at many major labs (Quest/LabCorp, or research labs). Creatinine, eGFR, cystatin C (kidney function) Why: Declining kidney function strongly predicts morbidity and mortality. Where to test: Quest/LabCorp. ALT, AST, GGT (liver function / fatty liver risk) Why: Elevated liver enzymes often reflect fatty liver and metabolic dysfunction linked to shorter healthspan. Where to test: Quest/LabCorp. Complete blood count (CBC) with RDW, hemoglobin Why: Anemia and high RDW are robust predictors of mortality and frailty. Where to test: Quest/LabCorp. Vitamin D (25‑OH), ferritin (iron stores), homocysteine Why: Deficiencies or extremes are associated with worse outcomes; homocysteine is linked to vascular risk. Where to test: Quest/LabCorp; for intracellular micronutrients: SpectraCell Laboratories. NT‑proBNP (cardiac strain) — if cardiac risk or symptoms Why: Predicts heart failure and cardiovascular mortality even before symptoms. Where to test: Quest/LabCorp. Sex hormones & thyroid (total/free testosterone, estradiol, SHBG, TSH, free T4) Why: Hormonal balance affects muscle, bone, cognition, metabolic health and mortality risk. Where to test: Quest/LabCorp; specialty endocrine labs if needed. Additional/advanced biomarkers for “biological age” or deeper insight DNA methylation epigenetic clocks (Biological age) Why: Methylation clocks (Horvath, PhenoAge, GrimAge, etc.) provide an estimate of biological age and track intervention effects. Where to get them: TruDiagnostic is a well‑known provider that runs multiple DNAm clocks and gives longitudinal tracking and reports. Telomere length Why: Telomere shortening relates to cellular aging; interpretation is noisy but can be useful longitudinally. Where to test: Specialized labs such as LifeLength (and other telomere testing services). Interpret with caution. IgG glycan age (GlycanAge) Why: Changes in IgG glycosylation reflect immune ageing/inflammation and have been marketed as a glycan “biological age” test. Where to get it: GlycanAge (company) offers this as a direct‑to‑consumer test. Advanced micronutrient testing (intracellular) Why: Serum levels don’t always reflect functional status of vitamins/minerals. Where to test: SpectraCell Laboratories (micronutrient panel). Services that help interpret and act on results InsideTracker: aggregates standard and advanced labs, gives personalized, evidence‑based recommendations and lifestyle interventions — good for people who want actionable guidance tied to tests. WellnessFX: similar (labs + coaching), convenient for repeat monitoring and physician review. TruDiagnostic: for epigenetic clock testing and longitudinal methylation tracking. Everlywell / LetsGetChecked: convenient at‑home kits for some routine markers if access to lab draws is hard. Practical guidance Get a baseline at a reputable clinical lab (Quest or LabCorp) — they cover most standard and specialty tests and are accepted by physicians. Prioritize HbA1c/fasting glucose, ApoB/LDL‑P, hs‑CRP, eGFR/cystatin C, liver enzymes, CBC (with RDW), vitamin D, ferritin, and Lp(a). Add advanced tests (NMR/apoB, epigenetic clocks, micronutrients) based on budget and goals. Trends matter more than a single result. Recheck annually or sooner if you change interventions. Interpret results in context — age, sex, medications, comorbidities — and discuss abnormal findings with a clinician before starting treatments or supplements. Lifestyle (exercise, diet, sleep, smoking cessation, weight control) moves most of these markers in the right direction and remains the highest‑leverage strategy for longevity. If you want, tell me your age, sex, major health history, and whether you prefer in‑lab draws or at‑home kits, and I’ll recommend a specific testing panel and one or two services to order it from.

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