What does my CRP result mean? Is it a sign of infection or inflammation?

For evidence-based information about CRP (C-Reactive Protein) Test, visit this page.

Was standard CRP or hs-CRP measured? What is the difference?

For evidence-based information about CRP (C-Reactive Protein) Test, visit this page.

What may be causing my elevated CRP?

For evidence-based information about CRP (C-Reactive Protein) Test, visit this page.

Do I need additional tests for a more complete evaluation?

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How often should this test be repeated?

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CRP (C-Reactive Protein) Test

⚠️ Update approaching🔬 Evidence: StrongInternal Medicine

Diğer adları: C-reactive protein, CRP level, High-sensitivity CRP

⚠️

Discuss your test results with your doctor. This page is for informational purposes only and does not provide a diagnosis.

⚡ Key Facts

• A protein produced by the liver in response to inflammation, infection, and tissue damage • Non-specific — may rise in many different conditions • Standard CRP evaluates acute inflammation; hs-CRP assesses low-grade chronic inflammation and cardiovascular risk • Normal standard CRP: <5 mg/L

🧪 What Does This Test Measure?

The CRP test measures C-reactive protein, produced by the liver in response to inflammation, infection, and tissue damage throughout the body.

📋 Why Is It Ordered?

Ordered for infection and inflammation evaluation, monitoring treatment response, autoimmune disease follow-up, and cardiovascular risk assessment (hs-CRP).

🔧 Preparation

CRP testing generally requires no special preparation. Fasting is not required.

📊 Reference Ranges

Standard CRP: Normal: <5 mg/L (some labs: <10 mg/L) Mild: 10–40 mg/L Moderate: 40–200 mg/L Severe: >200 mg/L hs-CRP (cardiovascular risk): <1 mg/L: low risk 1–3 mg/L: moderate risk >3 mg/L: higher risk

⬆️ High Values

Elevated CRP may be associated with bacterial infection, autoimmune disease, tissue damage, or postoperative inflammation. Mild elevations may be associated with obesity, smoking, or chronic conditions.

⬇️ Low Values

Low CRP generally suggests the absence of active inflammation or infection. Low hs-CRP is considered favorable for cardiovascular risk.

⚙️ What Can Affect Results?

Obesity, smoking, medications, physical activity, sleep quality, and acute infections are key factors that may affect CRP results.

🔬 Evidence Summary

Strong evidence: 2 guidelines, 1 meta-analysis, 1 clinical trial (RCT), 3 reviews.

📚 Most Important Studies on This Topic

Markers of inflammation and cardiovascular disease: application to clinical and public health practice — AHA/CDC Scientific Statement

Guideline· Circulation · 2003 · PMID: 12551878

C-reactive protein: a critical update

Review· The Journal of Clinical Investigation · 2003 · PMID: 12813013

Rosuvastatin to prevent vascular events in men and women with elevated C-reactive protein

Clinical trial (RCT)· The New England Journal of Medicine · 2008 · PMID: 18997196

✅ Key Takeaways

💡

What you learned: CRP is a non-specific marker of inflammation and infection; an elevated result does not establish a diagnosis on its own. Standard CRP is used for acute conditions; hs-CRP is used for cardiovascular risk assessment.

⛔

A CRP result alone cannot diagnose infection, inflammation, or heart disease. Clinical context and supporting tests are needed.

🔬 Sources Used on This Page

8 sources · Most recent publication: 2024

📋

Guideline

Expert society and guideline recommendations

sources

📊

Systematic review / meta-analysis

Combined analysis of multiple studies

source

🔬

Clinical trial (RCT)

Controlled research conducted in humans

source

📖

Review

Comprehensive topic evaluation

sources

Overall assessment: Evidence level for this topic is strong. This page is supported by 2 guidelines, 1 systematic review/meta-analysis, 1 clinical trial, 4 reviews.

📝 Questions to Ask Your Doctor

Be prepared for your appointment. Add questions to your list.

📋 References

[PMID: 38947332] C-reactive protein: structure, function, regulation, and role in clinical diseases. Frontiers in Immunology, 2024.

[PMID: 29951057] The Clinical Significance and Potential Role of C-Reactive Protein in Chronic Inflammatory and Neurodegenerative Diseases. Frontiers in Immunology, 2018.

[PMID: 24196453] ACC/AHA guideline on the assessment of cardiovascular risk. Journal of the American College of Cardiology, 2014.

[PMID: 20497597] To JUPITER and beyond: statins, inflammation, and primary prevention. The Lancet, 2010.

[PMID: 18997196] Rosuvastatin to prevent vascular events in men and women with elevated C-reactive protein. The New England Journal of Medicine, 2008.

[PMID: 15307030] Serum procalcitonin and C-reactive protein levels as markers of bacterial infection: a systematic review and meta-analysis. Clinical Infectious Diseases, 2004.

[PMID: 12551878] Markers of inflammation and cardiovascular disease: application to clinical and public health practice — AHA/CDC Scientific Statement. Circulation, 2003.

[PMID: 12813013] C-reactive protein: a critical update. The Journal of Clinical Investigation, 2003.

Last reviewed: 3/26/2026

Next review: 3/26/2027

⚖️ Comparisons

CRP vs ESR→

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⚖️ This page does not replace medical advice. Make treatment decisions with your doctor.
Content is based on scientific studies indexed in PubMed and current clinical guidelines.