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

Why CRP Matters in Your Health

CRP is a marker that rises when your body fights inflammation. High levels may signal infections, injuries, or certain health conditions that require attention. Your doctor may order this test to check for inflammation, guide treatment, or monitor chronic conditions like arthritis or heart disease.

When This Test Is Done

Your doctor might recommend this test if you have symptoms of inflammation (like fever, pain, or swelling), if you’re recovering from surgery or illness, or if you have a known condition that causes chronic inflammation. It’s also sometimes used as a screening tool for heart disease or to track how well certain treatments are working.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for 8–12 hours before the test if it’s part of a broader blood panel. On the day of the test, avoid strenuous activity or taking anti-inflammatory medications (like ibuprofen) unless your doctor approves.

What the Results Mean

Results are reported in milligrams per deciliter (mg/dL). A higher than normal CRP level may indicate inflammation, but it doesn’t always pinpoint the exact cause. Your doctor will interpret results in the context of your symptoms and medical history.