A CRP blood test, also known as a C-reactive protein test, is a blood test that measures the level of C-reactive protein (CRP) in a person's blood. CRP is a protein that is produced by the liver in response to inflammation in the body. The level of CRP in the blood can be a useful indicator of infection or inflammation. The test is often ordered as part of a routine medical examination or when a person is experiencing certain symptoms, such as fever or pain.
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