C-reactive protein (CRP) – Serum/Plasma Substance Concentration (scnc)

Why Is This Test Done?

Your doctor may order a CRP test to check for signs of inflammation in your body. This can help diagnose conditions such as infections (like pneumonia or appendicitis), autoimmune diseases (like rheumatoid arthritis), or monitor conditions like heart disease or certain cancers. It may also be used before or after surgery to assess risk.

What Does a High or Low CRP Level Mean?

A higher CRP level often indicates inflammation, but it doesn’t always pinpoint the exact cause. Very high levels may suggest severe infections or other serious conditions. Very low levels might mean your body isn’t responding to inflammation as expected, though this can also occur with certain medications or medical conditions.

Sample Preparation and Testing

This test uses a blood sample drawn from a vein, typically in your arm. The blood is processed to separate serum or plasma for testing. The CRP level is measured using an immunoassay method, which detects the protein in your blood.

What to Expect Before the Test

No special preparation is needed for this test. You can eat and drink normally before your blood draw. If you’re on blood-thinning medication, let your doctor know before the test.