Author: MAI Medical Information Team ·
Reviewed: 2026-04-13 ·
Sources: WHO, UpToDate, PubMed
CRP Test Explained: What It Is, Normal Range & What High CRP Means
CRP (C-Reactive Protein) is one of the most important inflammation markers in your blood. It's a protein produced by your liver in response to inflammation anywhere in your body.
CRP Normal Range
| Level | Value (mg/L) | Interpretation |
|---|---|---|
| Normal | <5 | No significant inflammation |
| Mild elevation | 5–10 | Mild inflammation or viral infection |
| Moderate elevation | 10–50 | Active infection or inflammatory process |
| High elevation | 50–200 | Severe bacterial infection |
| Very high | >200 | Sepsis or severe condition — seek emergency care |
What Does Elevated CRP Mean?
Elevated CRP indicates an inflammatory process in your body. This can be caused by:
- Infection — bacterial, viral, or fungal
- Autoimmune disease — rheumatoid arthritis, lupus
- Trauma or surgery — normal response
- Chronic diseases — Crohn's disease, ulcerative colitis
- Cardiovascular disease
Key fact: CRP responds quickly — it rises within 6–12 hours of inflammation onset
and returns to normal within 1–2 days after inflammation resolves. This makes it an excellent rapid marker.
CRP and Heart Disease Risk
High-sensitivity CRP (hs-CRP) is used to assess cardiovascular risk:
| hs-CRP Level | Heart Disease Risk |
|---|---|
| <1.0 mg/L | Low risk |
| 1.0–3.0 mg/L | Moderate risk |
| >3.0 mg/L | High risk |
How to Lower CRP
- Treat the underlying cause — if it's an infection, appropriate treatment is needed
- Anti-inflammatory diet: fish, nuts, berries, vegetables, olive oil
- Regular exercise — reduces chronic inflammation
- Weight management — excess weight increases CRP
- Quality sleep — sleep deprivation increases inflammation
- Stress management — chronic stress raises CRP
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⚠️ Important: This article is for informational purposes only and does not constitute medical advice.
Always consult your doctor before making health decisions.
Sources: World Health Organization (WHO), UpToDate Clinical Reference, PubMed Medical Research Database.
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Sources: World Health Organization (WHO), UpToDate Clinical Reference, PubMed Medical Research Database.