Two people with the same cholesterol can face very different odds of a heart attack, and inflammation is one reason why. hs-CRP measures that inflammation, and it predicts cardiovascular risk even when a standard cholesterol panel looks clean. The 2026 AHA/ACC guidelines treat inflammation as part of heart-disease risk, not a separate question.
This page covers what hs-CRP measures, what counts as a good level, why a single high reading can mislead, and what the evidence says about lowering it.
What is hs-CRP and why does it matter?
hs-CRP is a blood marker of inflammation, and inflammation drives how plaque forms, grows, and ruptures in your arteries. C-reactive protein rises whenever there’s inflammation in the body, and the high-sensitivity assay picks up the low levels that predict heart risk. Over 30 years of follow-up in the Women’s Health Study, higher hs-CRP tracked with more cardiovascular events, on a par with LDL cholesterol, so it captures risk a lipid panel alone can miss.
Cumulative cardiovascular events over 30 years, split by quintile of hs-CRP (top) and LDL cholesterol (bottom). Higher hs-CRP predicts risk on a par with LDL. Source: Women’s Health Study.
What is a good hs-CRP level?
A good hs-CRP is below 1 mg/L, which is low cardiovascular risk. 1 to 3 mg/L is moderate risk, and above 3 mg/L is high risk. One caveat matters: a single high reading often reflects a temporary cause like a cold, injury, vaccine, or dental work, not your baseline. Any value above 10 mg/L is almost always acute, so wait at least two weeks after an illness resolves and retest. Because hs-CRP can move a borderline estimate up or down, the 2026 AHA/ACC guidelines use it as a risk enhancer when your ten- or thirty-year risk sits near a decision threshold.
What is a normal hs-CRP by age?
In NHANES 2021-2023, the median hs-CRP was about 1.31 mg/L for adults aged 18-29 and 1.8 mg/L for adults aged 70 and older. The chart below shows the full distribution by age and sex.
Median hs-CRP by age and sex, with the 10th to 90th percentile band. Source: NHANES 2021-2023 (weighted estimates).
hs-CRP vs CRP
hs-CRP and CRP measure the same protein (C-reactive protein), but hs-CRP uses a more sensitive assay that can detect much lower concentrations. Standard CRP tests are used to detect significant inflammation from infections or autoimmune conditions, while hs-CRP is specifically designed to measure the subtle, low-grade inflammation that predicts cardiovascular risk.
Does lowering hs-CRP reduce heart attacks?
Lowering inflammation appears to lower risk, not just the number. In the JUPITER trial, people with normal LDL but elevated hs-CRP who took a statin had significantly fewer heart attacks and strokes, and statins lower hs-CRP through a pathway separate from their effect on cholesterol. Diet, weight loss, regular exercise, and quitting smoking all lower hs-CRP too.
In JUPITER, a statin cut cardiovascular events in people who had normal LDL but elevated hs-CRP. Source: JUPITER trial.
For more, see how statins lower inflammation and lowering inflammation with diet and medication. Talk to your clinician before starting or changing any medication.
What to test alongside hs-CRP
hs-CRP is most useful read next to your cholesterol particle numbers. ApoB counts the atherogenic particles that inflammation acts on, and LDL cholesterol is the standard lipid measure. Lp(a) is an inherited particle worth checking once in your life. Both hs-CRP and Lp(a) can sharpen the PREVENT risk equations, which we cover in adding Lp(a) and hs-CRP to PREVENT.
