CRP Test – What You Need to Know (For Patients)

What is a CRP Test?

The C-reactive protein (CRP) test is a simple blood test used to detect inflammation in the body. CRP is a substance produced by the liver in response to inflammation caused by infections, injuries, or chronic diseases.

Why is the CRP Test Done?

Doctors recommend a CRP test to:

• Detect infections, especially bacterial infections

• Monitor inflammatory or autoimmune diseases like rheumatoid arthritis or lupus

• Assess flare-ups or response to treatment in chronic inflammatory conditions

• Evaluate inflammation-related complications in cases like pneumonia, sepsis, or inflammatory bowel disease

How is the Test Done?

A small amount of blood is drawn from a vein in your arm. The test usually doesn’t require fasting or special preparation, and results are available within a few hours to a day.

What Do the Results Mean?

Typical CRP values are interpreted as follows:

• Mild elevations (1–10 mg/dL): Seen in mild infections, chronic inflammatory conditions, or after minor tissue injury.

• Moderate elevations (10–50 mg/dL): Seen in more significant infections (including some viral and bacterial infections) or active autoimmune disease.

• Severe elevations (>50 mg/dL): Strongly suggest acute bacterial infection or severe inflammatory response (e.g., sepsis, severe COVID-19).

• Very high levels (>100 mg/dL): Indicate life-threatening inflammation, such as severe sepsis or cytokine storm in critical illness.

Limitations of the Test:

The CRP test only tells you that inflammation is present—it doesn’t identify the exact cause. Your doctor may order additional tests to diagnose the underlying problem.

Is Fasting Required?

No fasting is generally needed unless it is combined with other blood tests.

Summary for Patients:

A CRP test is a useful indicator of inflammation in the body. If your levels are elevated, your doctor will investigate further to find the cause and suggest treatment accordingly. It’s a valuable tool for monitoring disease activity and treatment response in several conditions.

Dr. Karuturi Subrahmanyam, MD, FRCP (London), FACP (USA)

Internal Medicine Specialist

Kify Hospital

Danavaipeta

Rajahmundry

Phone : 85000 23456

www.KifyHospital.com