C-reactive protein (CRP) measured by chemiluminescent immunoassay (CLIA) in plasma

Why Is This Test Done?

Your doctor may order CRP testing to check for signs of inflammation, monitor chronic conditions like arthritis or heart disease, or evaluate symptoms such as fever, pain, or swelling. It can also help guide treatment decisions or track how well a condition is responding to treatment.

What Does a High or Low CRP Level Mean?

A higher-than-normal CRP level often indicates inflammation, which can be caused by infections, injuries, or certain diseases. A very low level may suggest no active inflammation, but it’s not always definitive. Your doctor will interpret results in the context of your overall health and symptoms.

Sample Preparation and Testing Process

Blood is drawn from a vein in your arm, and the plasma is separated and sent to a lab for testing. The CRP level is measured using a sensitive immunoassay method to detect even small amounts of the protein.

Common Conditions Monitored with CRP

CRP is commonly used to monitor conditions like rheumatoid arthritis, inflammatory bowel disease, heart disease, or infections. It can also help assess the risk of future health problems, such as heart attacks or strokes, in some cases.