A C-reactive protein (CRP) test measures the level of CRP in your blood. CRP is a protein produced by the liver in response to inflammation. Elevated CRP levels indicate the presence of inflammation in the body. The CRP test is a valuable tool for detecting and monitoring inflammation in the body. It plays a critical role in diagnosing inflammatory and autoimmune diseases, assessing cardiovascular risk, and monitoring the effectiveness of treatments. By providing insights into the presence and intensity of inflammation, the CRP test helps healthcare providers make informed decisions about diagnosis, treatment, and disease management.