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

Why CRP Matters in Your Health

CRP is often used as a simple blood test to detect inflammation, which can signal underlying health problems. High levels may indicate conditions such as infections, autoimmune diseases (like rheumatoid arthritis), or other inflammatory processes. Doctors may order this test to monitor chronic conditions or check for signs of new health concerns.

How the Test Works

Your blood sample is analyzed using a nephelometric method, which measures how much CRP is present in your serum or plasma. This test is highly sensitive and can detect even small amounts of CRP, making it useful for early detection of inflammation.

What to Expect Before the Test

No special preparation is usually needed for this test. You may be asked to fast for 8–12 hours before the blood draw if your doctor specifies it, but this is not always required. Avoiding strenuous activity or certain medications (like nonsteroidal anti-inflammatory drugs) may be advised if your doctor recommends it.

What the Results Mean

Results are reported in milligrams per liter (mg/L) or micrograms per milliliter (µg/mL). While reference ranges vary by lab, very high levels (above 10 mg/L) often signal severe inflammation or infection, while moderate levels (3–10 mg/L) may indicate mild inflammation. Your doctor will interpret results in the context of your overall health and symptoms.