C-Reactive Protein (CRP) Test: An Overview

C-Reactive Protein (CRP) is a protein produced by the liver that is used as a marker of inflammation in the body. The CRP test measures the amount of CRP in the blood and is used to diagnose and monitor various conditions, including infections, inflammatory diseases, and cardiovascular disease. In this article, we will explore the CRP test in detail, including its normal range, its uses, and frequently asked questions.

What is the Normal Range of CRP?

The normal range of CRP varies depending on the laboratory that performs the test. Generally, a CRP level of less than 1 milligram per liter (mg/L) is considered normal, while levels above 3 mg/L indicate a higher risk of cardiovascular disease. The table below provides a summary of the normal ranges of CRP for adults.

CRP Level (mg/L) Interpretation

  • <1 : Normal
  • 1-3 : Slightly Elevated
  • >3 : Elevated

Why is the CRP Test Performed?

The CRP test is performed to diagnose and monitor a variety of conditions, including infections, inflammatory diseases, and cardiovascular disease. Some common uses of the CRP test include:

Diagnosing bacterial infections: CRP levels increase rapidly in response to bacterial infections, so the test can be used to diagnose conditions such as pneumonia, meningitis, and sepsis.

Monitoring inflammatory diseases: CRP levels are often elevated in inflammatory diseases such as rheumatoid arthritis, lupus, and inflammatory bowel disease. The test can be used to monitor disease activity and assess the effectiveness of treatment.

Assessing the risk of cardiovascular disease: Elevated CRP levels are associated with an increased risk of cardiovascular disease, including heart attacks and strokes. The test can be used to assess an individual’s risk of developing these conditions.

How is the CRP Test Performed?

The CRP test is a simple blood test that can be performed in a laboratory or doctor’s office. The healthcare provider will clean the area around the vein and insert a needle to draw blood. The blood sample will then be sent to a laboratory for analysis.

Are there any Risks or Side Effects Associated with the CRP Test?

The CRP test is a simple and safe procedure with few risks or side effects. Some individuals may experience minor discomfort or bruising at the site where the blood was drawn.


“C-Reactive Protein (CRP) Test.” Mayo Clinic. https://www.mayoclinic.org/tests-procedures/c-reactive-protein-test/about/pac-20385228

“C-Reactive Protein (CRP) Blood Test.” WebMD. https://www.webmd.com/a-to-z-guides/c-reactive-protein-crp

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