C-reactive protein (CRP) concentration, serum/plasma

Why This Test Is Done

Your healthcare provider may order a CRP test to check for signs of inflammation, monitor conditions like infections, autoimmune diseases, or heart disease, or evaluate responses to treatments. It can also be used to screen for certain risks or to guide decisions about further testing or treatments.

What to Expect During the Test

A blood sample is taken from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The blood is then sent to a lab for analysis. No special preparation is typically needed, but always follow your provider’s instructions.

Common Conditions Monitored

CRP is often checked for conditions such as infections (like pneumonia or sepsis), inflammatory diseases (like rheumatoid arthritis or lupus), heart problems (such as coronary artery disease), or to monitor how well you’re responding to treatments for these conditions.

What the Results Mean

Higher than normal CRP levels often indicate inflammation or infection, but the exact meaning depends on your overall health, symptoms, and other test results. Your healthcare provider will interpret the results in the context of your medical history and other findings.