CRP and hs-CRP
A protein produced by the liver in response to inflammation — in its high-sensitivity form (hs-CRP) it has become one of the most widely studied additional markers of cardiovascular risk.
Number of studies
1
Safety
Moderate
Time to effects
Not applicable — CRP and hs-CRP are diagnostic tests, not interventions.
Who it's for
Table of contents
TL;DR
A protein produced by the liver in response to inflammation — in its high-sensitivity form (hs-CRP) it has become one of the most widely studied additional markers of cardiovascular risk.
- →Helps refine cardiovascular risk assessment in people with intermediate risk
- →Provides information independent of the lipid profile
- →May help identify chronic, low-grade inflammation requiring further diagnostic work-up
| Type of test | Acute-phase protein, produced by the liver in response to inflammation |
|---|---|
| Evidence level | Strong — hs-CRP is a recognized, additional cardiovascular risk marker |
| Target group | People with intermediate cardiovascular risk requiring refinement |
| Important limitation | A nonspecific marker — also elevated by infections, obesity, and autoimmune diseases |
| Status | A standard diagnostic test available at most laboratories |
Understand
Overview
C-reactive protein (CRP) is an acute-phase protein, produced by the liver in response to pro-inflammatory signals (mainly interleukin-6), whose blood concentration rises sharply during acute inflammation, infection, or injury. Standard CRP testing has long been used to assess acute infections and inflammatory states, but a more sensitive variant of the same test — high-sensitivity CRP (hs-CRP) — has gained particular importance in preventive cardiology.
Research by Ridker, one of the most influential researchers in this field, showed that even a small, chronic elevation of hs-CRP, within ranges considered 'normal' in the context of acute infections, is associated with increased risk of future cardiovascular events, independent of LDL cholesterol levels. This finding cemented the view that chronic, low-grade inflammation is a distinct, important element of atherosclerosis pathogenesis, not merely a side effect of lipid disorders.
Who can realistically benefit from this? People with intermediate cardiovascular risk (neither clearly low nor high based on traditional risk factors), in whom hs-CRP can help refine the decision about the intensity of prevention. It's worth remembering that hs-CRP is a nonspecific marker — it can be elevated for many other reasons (infection, obesity, autoimmune disease), so its interpretation always requires consideration of the full clinical picture.
Mechanism of action
In response to tissue damage, infection, or chronic inflammation, immune cells release pro-inflammatory cytokines, primarily interleukin-6, which stimulates hepatocytes (liver cells) to increase production of acute-phase proteins, including CRP. The standard CRP test is calibrated to detect the high concentrations typical of acute infections, while the high-sensitivity test (hs-CRP) allows precise measurement of much lower concentrations, relevant in the context of the chronic, low-grade inflammation characteristic of atherosclerosis.
CRP itself is probably not solely a passive marker but may actively participate in the atherosclerotic process — laboratory studies suggest CRP may promote vascular endothelial dysfunction and uptake of oxidized LDL by macrophages in the arterial wall, though the exact causal role of CRP (as distinct from merely marking an ongoing inflammatory process) is still under investigation.
Release of interleukin-6
Immune cells release IL-6 in response to tissue damage or inflammation.
Stimulation of CRP production in the liver
IL-6 stimulates hepatocytes to increase production of C-reactive protein.
Possible role in the atherosclerotic process
CRP may promote endothelial dysfunction and uptake of oxidized LDL by macrophages.
Evidence: strong — based on 1 study in this database.
Benefits
Common myths
MythElevated hs-CRP always means heart disease.
Facths-CRP is a nonspecific marker — it can be elevated for many other reasons, including obesity, infection, or autoimmune disease, so its interpretation requires the full clinical picture.
MythStandard CRP and hs-CRP are exactly the same test.
FactBoth measure the same protein, but hs-CRP is calibrated to detect much lower concentrations, relevant for assessing chronic, low-grade inflammation rather than acute infections.
Forms & variants
CRP and hs-CRP comes in several forms that differ in bioavailability and use case — the form you pick genuinely matters for how effective the supplementation is.
Standard CRP
Detects the high concentrations typical of acute infections and inflammatory states.
Best for: Diagnosing acute infections
hs-CRP (high-sensitivity)
Precisely measures the low concentrations relevant to chronic inflammation.
Best for: Cardiovascular risk assessment
Practice
Frequently asked questions
Generally accepted thresholds classify below 1 mg/L as low risk, 1–3 mg/L as moderate, and above 3 mg/L as high cardiovascular risk, though interpretation should account for the full clinical context.
No, CRP and hs-CRP don't require fasting, unlike some other blood tests.
Weight reduction, regular physical activity, quitting smoking, and an anti-inflammatory diet (e.g. Mediterranean) are associated with lower hs-CRP levels in studies.
What to combine with
Good combinations
Lipid Panel — hs-CRP is sometimes assessed together with a lipid panel for a fuller cardiovascular risk evaluation
Safety
Side effects & contraindications
Possible side effects
Contraindications
No significant contraindications at typical doses.
Interactions
Recent infection, injury, or surgery can significantly raise the result independent of cardiovascular risk
Is it worth taking?
Who it's for
- People with intermediate cardiovascular risk based on traditional risk factors
- People wanting to supplement a standard lipid panel with an additional risk marker
Not for
- No significant contraindications at typical doses.
Evidence
Worth knowing
Ridker's research on hs-CRP is among the most influential work linking chronic inflammation to cardiovascular risk.
hs-CRP is especially useful in people with intermediate cardiovascular risk, where traditional risk factors don't give a clear picture.
Studies
Even a small, chronic elevation of high-sensitivity CRP is associated with increased risk of future cardiovascular events, independent of LDL cholesterol levels.
Ridker PM, Circulation, 2001
High-sensitivity C-reactive protein: potential adjunct for global risk assessment in the primary prevention of cardiovascular disease
Strong evidenceRidker PM · Circulation · 2001
A paper discussing the role of high-sensitivity CRP as an additional cardiovascular risk marker, independent of traditional risk factors.
View studySources & bibliography
Citations are illustrative for this demo version and require full bibliographic verification by the editorial team before production publication.
Compare with similar entries
About the authors of this entry
Author
dr Piotr ZielińskiEndocrinologist
Piotr reviews content on hormones, metabolic health and supplement pharmacology.
131 publications on this site
Medical review
dr Anna KowalczykEditor-in-Chief, Molecular Biology
Anna oversees the editorial process and scientific review of every publication in the knowledge base. She previously researched autophagy and mitochondrial biology.
50 publications on this site
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Comments (2)
- KW
Kasia W. 2 weeks ago
Very clearly explained, especially the interactions section — I hadn't seen it laid out this well anywhere else.
- MT
Marek T. a month ago
Are you planning to update this with the newest study from this year? I saw an interesting meta-analysis.