When your body is fighting off an infection or dealing with inflammation, it sends out signals—and one of those signals is a protein called C-reactive protein (CRP). A CRP test is a simple yet powerful tool that helps doctors detect inflammation and monitor a wide range of health conditions.
What Is a CRP Test?
A CRP test measures the level of C-reactive protein in your blood. This protein is made by your liver and released into the bloodstream in response to inflammation. Elevated CRP levels can be a sign of infection, chronic disease, or even an increased risk of heart problems.
There’s also a more sensitive version called the high-sensitivity CRP (hs-CRP) test, which can detect lower levels of inflammation and is often used to assess heart disease risk.
Why Is It Done?
Doctors may order a CRP test to:
- Check for infections such as sepsis or pneumonia
- Monitor chronic inflammatory conditions like rheumatoid arthritis or lupus
- Evaluate heart disease risk, especially with the hs-CRP test
- Track recovery after surgery or treatment for infection
It’s important to note that while the test can detect inflammation, it doesn’t pinpoint the exact cause or location. That’s why it’s often used alongside other tests.
What to Expect During the Test
The CRP test is a simple blood draw, usually from a vein in your arm. No fasting or special preparation is needed. You might feel a quick pinch, but the procedure is generally painless and over in minutes.
Understanding the Results
CRP levels are measured in milligrams per liter (mg/L). While each lab may have slightly different reference ranges, here’s a general guide:
- Low risk: Less than 1 mg/L
- Average risk: 1–3 mg/L
- High risk: Over 3 mg/L
Very high levels (above 10 mg/L) may indicate a serious infection or chronic inflammatory disease.
Final Thought
The CRP test may be small in procedure, but it plays a big role in understanding what’s happening inside your body. Whether it’s used to detect infection, monitor a chronic condition, or assess heart health, it’s a valuable tool in your wellness journey.
