InflammationUpdated 2025-12-24Medically Reviewed
CRP (C-Reactive Protein)
Everything you need to know about CRP (C-Reactive Protein) levels, including what normal ranges look like and what abnormal results might indicate.
Standard Reference Range
Unit: mg/LMale Reference Range
<3 mg/L
Female Reference Range
<3 mg/L
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Reference ranges may vary slightly between laboratories. Always consult your doctor for interpretation.
What is CRP?
C-Reactive Protein (CRP) is produced by the liver in response to inflammation. High-sensitivity CRP (hs-CRP) detects even low-grade inflammation linked to cardiovascular risk.
Key Takeaway
CRP rises quickly (within 6–8 hours) after inflammation starts and falls just as fast once the trigger resolves, making it useful for monitoring response to treatment.
Why is this test performed?
- Detect and monitor infections or inflammatory diseases
- Track flare-ups in conditions like rheumatoid arthritis
- Gauge response to antibiotics or anti-inflammatory therapy
- Assess cardiovascular risk with hs-CRP when combined with lipid profile
Interpreting Your Results
Mild Elevation (3–10 mg/L)
- Low-grade inflammation, obesity, smoking
- Early infection or recovery phase
Moderate to High Elevation (＞10 mg/L)
- Acute bacterial infection
- Autoimmune flare (e.g., rheumatoid arthritis)
- Tissue injury or surgery
Very High (＞100 mg/L)
- Severe bacterial infection or sepsis until proven otherwise
Related Tests
- LDH: Rises with broad tissue injury
- CK: Helps flag muscle-related inflammation
- Albumin: Often drops during significant inflammation
- AST/ALT: Check if liver involvement is suspected
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