C-reactive protein (CRP) by nephelometry (serum/plasma)

Why CRP Matters in Your Health

CRP is a marker that signals your body’s immune response. High levels may indicate inflammation, which can be caused by infections, injuries, or certain health conditions like arthritis or heart disease. Your doctor may use this test to check for early signs of problems or to monitor treatments.

How the Test Works

A small blood sample is taken from your arm and sent to a lab. The lab uses a special method called nephelometry to measure the amount of CRP in your blood. This test helps healthcare providers detect and track inflammation without needing invasive procedures.

Common Reasons for Testing

Doctors often order CRP tests to diagnose or monitor conditions like infections (such as pneumonia or urinary tract infections), autoimmune diseases (like rheumatoid arthritis), or to check for signs of inflammation after surgery or injury. It may also be used to evaluate heart disease risk or response to treatment.

What to Expect Before the Test

You can eat, drink, and move around normally before the test. No special preparation is needed, but let your doctor know if you’re on blood thinners or have any allergies. Avoid strenuous activity 24 hours before testing if your doctor advises it, as it may affect results.