Lab marker · High

High C-Reactive Protein (CRP): what it means

A C-Reactive Protein (CRP) result above the normal range is considered high. Here is what a raised C-Reactive Protein (CRP) can point to, and when it is worth discussing with a doctor.

Reference range: <3 mg/L low cardiovascular risk; >10 mg/L active inflammation

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What a high C-Reactive Protein (CRP) can mean

  • Bacterial infection — typically pushes CRP above 100 mg/L; viral infections rarely above 40.
  • Active autoimmune disease — rheumatoid arthritis, vasculitis, inflammatory bowel disease.
  • Tissue injury — myocardial infarction, surgery, burns, trauma.
  • Chronic low-grade inflammation — obesity, smoking, periodontal disease (typically 3–10 mg/L range).
  • Malignancy — particularly with bone marrow involvement.

When to discuss with a doctor

CRP above 100 mg/L typically indicates a bacterial infection or major inflammatory process and warrants prompt evaluation. Persistent values in the 10–40 range warrant a primary-care work-up for autoimmune disease, chronic infection or malignancy. For cardiovascular risk, hsCRP >3 mg/L on two readings without acute cause is associated with elevated 10-year risk and may guide statin decisions.

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Mediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.