LongevityJanuary 29, 2026·5 min read
By the CIRRUS Editorial Team — how we write and source this
Inflammation markers: what CRP actually tells you
A single blood test gets cited constantly in longevity discussions. Here's what it's measuring and its real limitations.
C-reactive protein (CRP) is produced by the liver in response to inflammation anywhere in the body — a high-sensitivity version of the test (hs-CRP) is used specifically in cardiovascular risk assessment, since chronic low-grade inflammation is implicated in atherosclerosis development.
The key limitation is specificity: CRP rises in response to essentially any inflammatory process — an infection, an injury, arthritis flare, or even recent intense exercise can all elevate it, which is why an isolated elevated reading isn't diagnostic of any single condition on its own.
This is why hs-CRP is generally interpreted alongside other cardiovascular risk factors — cholesterol panel, blood pressure, family history — rather than as a standalone test, and why physicians typically recheck an unexpectedly high result after ruling out an acute, unrelated cause like a recent cold.
As a longevity-adjacent marker, chronically elevated CRP over time (not a single reading) has shown associations with higher cardiovascular and all-cause mortality risk in population studies, which is the basis for its inclusion in some broader biological aging assessment panels.
This article is general health information, not medical advice, and doesn’t replace evaluation by your own physician. Talk to a doctor about anything specific to your own diagnosis or treatment.