Which blood biomarkers actually matter for longevity?

The blood biomarkers that matter most for longevity are the ones that track the biggest drivers of age-related disease: cardiometabolic risk, inflammation, and organ function. Across the sources you provided, the most consistently supported markers are ApoB / lipid profile, HbA1c and fasting glucose, hs-CRP, and kidney/liver markers such as creatinine, eGFR, ALT, AST, and GGT.[1][8][10][14]

In practical terms, the strongest “longevity” blood tests are:

• ApoB and the lipid panel: better reflect atherosclerotic risk than total cholesterol alone, and ApoB is repeatedly highlighted as a key vascular-risk marker.[1][10][14]
• HbA1c and fasting glucose: capture long-term and short-term glycemic exposure, which is strongly associated with healthspan and lifespan.[1][2][8][10]
• Fasting insulin: helps detect insulin resistance earlier than glucose alone; several longevity-oriented panels include it with HbA1c.[10][14]
• hs-CRP: a widely used marker of chronic low-grade inflammation linked to cardiovascular and other age-related disease.[1][6][8][10][13]
• Kidney function: creatinine, eGFR, and often cystatin C are important because renal decline tracks strongly with aging risk.[4][9][10][14]
• Liver function: ALT, AST, and GGT show up repeatedly in longevity and centenarian studies and panels.[2][4][7][9][14]
• Lipoprotein(a) [Lp(a)]: generally measured once because it is largely genetic and adds independent cardiovascular risk information.[1][10][14]
• Albumin and CBC markers like RDW: repeatedly appear in aging/exceptional-longevity literature as broader health-status signals.[4][7][15]

If you want the short answer: what actually matters most, prioritize these first:

• ApoB
• HbA1c
• Fasting glucose
• Fasting insulin
• hs-CRP
• Creatinine / eGFR
• ALT / AST / GGT
• Lp(a)[1][8][10][14]

A useful way to think about it is that longevity bloodwork is less about a single “aging marker” and more about repeatedly measuring the major pathways that shorten life: atherosclerosis, glucose dysregulation, inflammation, kidney/liver decline, and anemia/nutritional stress.[8][10][12]

There are also research-grade aging markers—especially epigenetic clocks like PhenoAge and GrimAge, plus proteomic markers such as GDF15—but these are more about age estimation and research tracking than routine clinical decision-making.[3][12][15]