Inflammation Markers: hs-CRP and Aging
A widely available marker of the inflammation that tracks with aging and disease.
Aging researchers increasingly talk about “inflammaging” — the low-grade, chronic inflammation that tends to creep upward as we get older and that correlates with many age-related diseases. It’s an appealing concept, and it raises a practical question: can you actually measure it? One widely available blood test, high-sensitivity C-reactive protein (hs-CRP), comes up most often. It’s useful, with real caveats worth understanding.
What hs-CRP is measuring
C-reactive protein is produced by the liver in response to inflammation. The “high-sensitivity” version can detect the low concentrations relevant to chronic, smoldering inflammation rather than the dramatic spikes of an acute infection. Because chronic low-grade inflammation is woven through the biology of cardiovascular disease, metabolic dysfunction, and aging more broadly, hs-CRP serves as a convenient, inexpensive window onto it.
The key framing: hs-CRP is a signal, not a diagnosis. An elevated reading says inflammation is present somewhere — it doesn’t say why, and a single value can be misleading.
The caveats that matter
hs-CRP is non-specific, which is its main limitation:
- It spikes with acute illness. A cold, an injury, or a recent infection can transiently raise it, so one reading taken at the wrong time misleads. Trends across multiple measurements are more informative than a single number.
- Many things move it. Body fat, smoking, poor sleep, and other conditions all influence it, so it reflects general inflammatory state rather than any one cause.
- It’s associative. Elevated hs-CRP travels with worse outcomes in large studies, but lowering the number is not automatically the same as lowering risk — the marker may be reporting a problem rather than being the problem itself.
How to think about it for aging
As a longevity tool, hs-CRP is best treated as one input among several, useful for spotting a pattern over time. Persistently elevated levels are a reasonable prompt to look at the modifiable drivers — fitness, body composition, sleep, smoking — that genuinely influence chronic inflammation. The honest limit is that we should be cautious about treating the number itself as the target; the goal is the underlying health it partly reflects.
The takeaway
hs-CRP is a cheap, accessible marker of the chronic inflammation that tracks with aging and disease, and that makes it genuinely useful — as a trend, interpreted in context, not as a one-off verdict. Read it as a smoke detector: a high reading is a reason to look for the source, not proof of any specific fire, and certainly not a number to chase for its own sake.
This is sample content created during site scaffolding. Replace with reviewed, fully-cited editorial before launch.