C-reactive protein (CRP) mass concentration in serum/plasma

Why Is This Test Done?

Doctors may order CRP tests to check for signs of inflammation, monitor chronic conditions like rheumatoid arthritis or lupus, or evaluate symptoms such as fever, pain, or swelling that could indicate infection, injury, or other health issues. It’s also used in some risk assessments for heart disease.

What Does a High CRP Level Mean?

Elevated CRP levels often signal inflammation. While high levels can point to infections (like pneumonia or urinary tract infections), they may also appear in conditions like heart disease, certain cancers, or autoimmune diseases. Your doctor will consider your symptoms and other test results to interpret the results.

What Does a Low CRP Level Mean?

Low CRP levels typically mean there is little to no active inflammation in your body. However, very low levels might raise concerns if you have a chronic condition that usually requires monitoring CRP, so always discuss results with your healthcare provider.

How Is This Test Performed?

A blood sample is taken from a vein, usually in your arm. The blood is then sent to a lab where it is processed to separate serum or plasma. The CRP protein is measured using a sensitive lab technique to detect its concentration.