A blood test reveals the burden of senescent cells across organs

Senescent cells—those that have stopped dividing but remain metabolically active—accumulate with age and secrete inflammatory proteins that progressively degrade tissues. Researchers have successfully detected cell-type-specific proteomic signatures of these cells in circulating blood, enabling a map of senescence burden by tissue type from a single sample. Across two independent longitudinal cohorts—the Baltimore Longitudinal Study of Aging (BLSA, n=1,275) and the InCHIANTI study (n=997)—senescence signatures derived from 14 human cell types predicted critical clinical parameters including biological age, walking pace, and hypertension with greater accuracy than other circulating biomarkers. This approach opens an unprecedented diagnostic pathway for longevity-focused individuals: assessing organ-specific functional status from a blood draw, laying groundwork for personalized anti-senescence interventions and accessible longitudinal monitoring in clinical practice.