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

Why Is CRP Tested?

Doctors may order a CRP test to check for signs of inflammation, monitor chronic conditions, or evaluate symptoms like fever, joint pain, or unexplained fatigue. It’s often used alongside other tests to assess risk for heart disease or to guide treatment decisions in conditions like rheumatoid arthritis or infections.

What Does CRP Measure?

CRP is a marker of inflammation. When your body detects harmful substances, such as bacteria or damaged cells, it triggers CRP production. Higher CRP levels may indicate active inflammation, but they can also rise gradually in some chronic health conditions.

How Is the CRP Test Performed?

A blood sample is drawn from a vein, usually in your arm. The sample is sent to a lab where it is analyzed to measure CRP concentration. The test typically takes a few hours to complete, and results are compared to general reference ranges.

What Are Common Uses of CRP?

CRP is commonly used to monitor inflammation in conditions like infections (e.g., pneumonia, urinary tract infections), autoimmune diseases (e.g., lupus, rheumatoid arthritis), and cardiovascular risks. It may also help assess response to treatment or detect early signs of disease progression.