Quest Test

C-Reactive Protein (CRP) Blood Test, Quantitative

Quick Overview

Determines whether a high or increasing amount of CRP in your blood suggests an acute infection or inflammation.

Test #4420


Availability: In stock

Also Known As C Reactive Protein, Cardiac; CRP
Preparation No special preparation required.
Test Results 1-2 days. May take longer based on weather, holiday or lab delays.

C-reactive protein (CRP) is a substance produced by the liver in response to inflammation.  High CRP levels can be an indicator that there’s inflammation in the arteries of the heart, which would indicate an elevated risk of a heart attack.  However, this CRP test is a general test that will check for inflammation int he body.  This test is extremely nonspecific and cannot pinpoint the exact location or what is causing it. 

Levels in the blood may be elevated when you have inflammation or an infection. CRP levels usually rise before you have symptoms of pain or fever and lower as you recover, the CRP test is especially useful for tracking infections. 

You may have this test to:

  • See if anti-inflammatory medications are working to treat a condition.
  • Check for flare-ups of diseases like lupus, vasculitis, or rheumatoid arthritis.

Note that a low CRP level does not always rule out the presence of inflammation.  Levels of CRP may not be increased in people with rheumatoid arthritis and lupus. The reason for this is unknown.

The more sensitive CRP test, the high-sensitivity C-reactive protein (hs-CRP) test, is available to determine a person's risk for heart disease.

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