hs-CRP, the inflammation dial High-Sensitivity C-Reactive Protein (hs-CRP)
The same protein measured far more finely, to pick up a low simmer.
Also printed ashs-CRP · CRP · C-Reactive Protein · hsCRP · Ultra Sensitive CRP · Cardio CRP
What it measures
The same protein measured precisely enough to resolve the low background range.
Tracks the slow, silent inflammation that ages arteries; it is read for heart risk, not for infection.
Why it matters for how long you stay well
Low-grade inflammation running for years quietly accelerates artery disease, and it is one of the few markers that answers to sleep, waist size and dental health rather than to anything from a pharmacy.
How it shows up in daily life
You will not feel low-grade inflammation. It shows up instead as slower recovery, poorer sleep and a body that takes longer to bounce back.
High and low readings
When it reads high
Something is inflamed: a cold, a gum, a joint, or slow metabolic strain. A recent illness invalidates the reading.
When it reads low
Low is good.
What moves it
Daily life
- weight around your middle
- sleep, especially broken sleep
- smoking
- gum disease
- regular exercise, which lowers it
Medicines known to shift it
- statins (lower it)
- steroids (lower it)
- NSAIDs (can lower it)
Listed so a result can be read in context. It is not advice to start, stop or change any medicine; that decision belongs with your physician.
Read it with
Markers that move this one, or that this one moves. One number read alone can mislead.
- Ferritin, your iron storeKnown mechanism
As this rises, Ferritin can be misread because of it
Ferritin doubles as an inflammation protein. So a healthy-looking ferritin drawn during an illness cannot prove your iron stores are actually full.
- Circulating ironKnown mechanism
As this rises, Circulating iron falls as it rises
During an infection your body hides iron away from the bloodstream, partly to keep it from feeding bacteria. So circulating iron drops while you are unwell.
- ESR, the settling rateObserved association
As this rises, ESR moves with it
Both tests pick up the same inflammation at different speeds. hs-CRP answers within a day or two, while the settling rate lags behind and takes weeks to come down.
- AlbuminKnown mechanism
As this rises, Albumin falls as it rises
During inflammation your liver switches from making albumin to making inflammation proteins. So albumin dips for a reason that has nothing to do with your diet.
Common questions
What does High-Sensitivity C-Reactive Protein measure?
The same protein measured precisely enough to resolve the low background range. Tracks the slow, silent inflammation that ages arteries; it is read for heart risk, not for infection.
What does a high hs-CRP result usually mean?
Something is inflamed: a cold, a gum, a joint, or slow metabolic strain. A recent illness invalidates the reading.
What does a low hs-CRP result usually mean?
Low is good.
What is the usual reference range for hs-CRP?
A broad adult reference band is below 1 mg/L. Labs differ, so read your result against the band printed on your own report.
Educational only, not a diagnosis. A single number means little without your history and the rest of your panel, so discuss your own results with your physician.
Typical adult reference band
- Adults
- below 1 mg/L
Labs differ. The band printed on your own report is the one that applies to your result.
Reported in mg/L
Ageing relevance
5/5
A direct input to a validated biological-age algorithm.
One of the nine blood inputs to the PhenoAge biological-age clock (Levine et al., Aging, 2018).
Indian reference data
Published data on this marker in Indian adults: Nazmi meta-analysis PMC4669860; South Asian hs-CRP 15-25% higher.
Worth knowing
It is the same protein as ordinary CRP; only the fineness of the measurement is different.
Related reading
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