C-reactive protein (CRP) quantitative measurement by probe-based immunoassay

Why Is This Test Done?

Your doctor may order this test to check for signs of inflammation, especially if you have risk factors for heart disease, such as high blood pressure or diabetes. It can also help monitor conditions like rheumatoid arthritis, lupus, or other inflammatory diseases. Sometimes, it’s used to evaluate symptoms like fever, joint pain, or unexplained fatigue without a clear cause.

What Does a High or Low CRP Level Mean?

A higher CRP level often means your body is fighting inflammation. For example, it may rise after an infection, injury, or during flare-ups of certain diseases. A very low CRP level might suggest your inflammation is under control, but it doesn’t always mean you’re healthy. Always discuss results with your doctor.

Sample Collection and Preparation

This test uses a blood sample drawn from a vein in your arm. The blood is processed to separate the serum (liquid part) for testing. No special preparation is needed, but tell your doctor about any medications or recent illnesses that might affect results.

What to Expect During the Test

You’ll likely sit or lie down while a healthcare provider inserts a small needle into your arm to draw blood. The process usually takes a few minutes. You may feel a slight pinch, but most people tolerate it well. Afterward, you can resume normal activities.