The C-reactive protein (CRP) test is a blood test that measures the level of CRP in the blood. CRP is a protein produced by the liver that increases in response to inflammation in the body. The test is commonly used to help diagnose or monitor infections and inflammatory diseases, such as rheumatoid arthritis and lupus.
During an infection or inflammation, CRP levels in the blood can rise rapidly and dramatically within a few hours. This is why the test is often used as an indicator of acute inflammation or infection. CRP levels can also be used to monitor the effectiveness of treatment for certain conditions and to assess the risk of developing cardiovascular disease.
The CRP test is a simple blood test that requires a small blood sample, usually taken from a vein in the arm. Results are typically available within a few hours to a few days, depending on the laboratory and testing method used. Normal CRP levels are generally less than 10 milligrams per liter (mg/L), but levels can vary depending on age, gender, and other factors.
It’s important to note that while the CRP test can provide useful information, it’s not a definitive diagnostic tool on its own. High CRP levels can indicate inflammation or infection, but additional tests and evaluations are usually needed to determine the underlying cause.
