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What is a normal CRP level in adults?

Published in Medical Biomarker 2 mins read

A normal C-reactive protein (CRP) level in adults is less than 3 mg/L.

Understanding CRP Levels

CRP, or C-reactive protein, is a protein produced by the liver. Its levels in the blood increase when there's inflammation in the body. Measuring CRP is a common way to check for inflammation caused by infections, injuries, or chronic diseases.

Normal vs. Elevated CRP Levels

CRP Level (mg/L) Interpretation
Less than 3 Considered normal
Above 3 May indicate inflammation


  • Normal CRP: A CRP value less than 3 mg/L is generally considered normal in healthy adults.
  • Elevated CRP: A CRP level above 3 mg/L may indicate the presence of inflammation. It's important to note that the specific cause of inflammation needs further investigation.

Factors Affecting CRP Levels

Several factors can affect CRP levels, including:

  • Infections: Bacterial or viral infections can significantly elevate CRP levels.
  • Chronic Inflammatory Conditions: Diseases like rheumatoid arthritis, lupus, and inflammatory bowel disease often cause chronically elevated CRP.
  • Injury or Trauma: Physical injuries can trigger an inflammatory response and increase CRP levels.
  • Cardiovascular Disease: Increased CRP has been linked to a higher risk of cardiovascular events.
  • Lifestyle: Factors like obesity, smoking, and unhealthy diet can contribute to higher CRP levels.

Practical Insight

If your CRP level is above 3 mg/L, it is important to consult with your healthcare provider. They can investigate the underlying cause and recommend appropriate treatment. Further tests may be necessary to determine the specific reason for the inflammation.