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C-Reactive Protein (CRP)


A C-reactive protein (CRP) test is a blood test that measures the amount of a protein called C-reactive protein in your blood.


The normal values listed here-called a reference range-are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.

Results are usually available within 24 hours.

C-reactive protein (CRP) 1

Less than 1.0 milligram per deciliter (mg/dL) or less than 10 milligrams per liter (mg/L)

Any condition that results in sudden or severe inflammation may increase your CRP levels.

Some medicines may decrease your CRP levels.

Many conditions can change CRP levels. Your doctor will talk with you about any abnormal results that may be related to your symptoms and past health.

High-sensitivity C-reactive protein (hs-CRP) levels

High-sensitivity C-reactive protein (hs-CRP) measures very low amounts of CRP in the blood. This test may help find your risk of heart problems, especially when it is considered along with other risk factors such as cholesterol, age, blood pressure, and smoking. It may be done to find out if you have an increased chance of having a sudden heart problem, such as a heart attack or stroke. But the connection between high CRP levels and heart disease risk is not understood very well.

High-sensitivity C-reactive protein (hs-CRP) level 1

Less than 0.1 mg/dL or less than 1 mg/L

hs-CRP level and heart disease risk 2

Less than 1.0 mg/L

Low risk

1.0 to 3.0 mg/L

Average risk

More than 3.0 mg/L

High risk

What Affects the Test

You may not be able to have the test or the results may not be helpful if:

WebMD Medical Reference from Healthwise

Last Updated: June 20, 2014
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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