The CRP ( C Reactive Protein ) Test is a blood test that measures the level of CRP in the body to detect and monitor inflammation and infection in various conditions and diseases. CRP is produced by the liver in response to inflammation in the body. CRP Test Here are the basic details for the CRP Test . Understand the CRP blood test , its purpose, normal ranges , and interpreting test results. Learn about CRP levels, what they mean, and when to get tested. Learn what a C-reactive protein ( CRP ) test measures, how to prepare for it, and what the results mean. Find out how CRP levels can indicate inflammation, infection, or heart disease risk, and what you can do to lower them.