C-reactive protein (CRP) measured by high-performance liquid chromatography (HPLC) or similar quantitative method in plasma

Why This Test Might Be Ordered

Your healthcare provider may order this test to check for signs of inflammation, monitor chronic conditions (such as rheumatoid arthritis or heart disease), or evaluate symptoms like fever, joint pain, or swelling. It can also help determine if an infection is present or if your body is reacting to an injury.

What to Expect Before the Test

No special preparation is needed for this test. You’ll typically have a small needle inserted into your arm to draw a blood sample. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

Higher-than-normal CRP levels often indicate inflammation, but they can also be elevated due to other factors like stress, certain medications, or recent illness. Your results will be interpreted by your healthcare provider in the context of your overall health and symptoms.

Common Conditions Monitored

CRP is commonly used to track conditions like inflammatory diseases (e.g., lupus, arthritis), infections (e.g., pneumonia, sepsis), or to assess cardiovascular risk. It’s also sometimes used to monitor treatment responses in certain conditions.