C-Reactive Protein (CRP) Test
Test Overview
A C-reactive protein (CRP) test is a blood test that measures the amount of a protein, Opens dialog called C-reactive protein in your blood. C-reactive protein measures general levels of inflammation, Opens dialog in your body.
High levels of CRP are caused by infections and many long-term diseases. But a CRP test cannot show where the inflammation is located or what is causing it. Other tests are needed to find the cause and location of the inflammation.
This test is used to:
- Check for infection after surgery.
- Find out if you have an increased chance of having a sudden heart problem, such as a heart attack.
- Identify and keep track of infections and diseases that cause inflammation, such as:
- Lymphoma (cancer of the lymph nodes).
- Giant cell arteritis (painful swelling of the blood vessels in the head and neck).
- Rheumatoid arthritis (painful swelling of the tissues that line the joint).
- Osteomyelitis (infection of a bone).
A health professional uses a needle to take a blood sample, usually from the arm.
How long the test takes
The test will take a few minutes.
Watch
When a blood sample is taken, you may feel nothing at all from the needle. Or you might feel a quick sting or pinch.
There is very little chance of having a problem from this test. When a blood sample is taken, a small bruise may form at the site.
Each lab has a different range for what's normal. Your lab report should show the range that your lab uses for each test. The normal range is just a guide. Your doctor will also look at your results based on your age, health, and other factors. A value that isn't in the normal range may still be normal for you.
Results are usually available within 24 hours.
High levels of CRP are caused by infections and many long-term diseases.
Current as of: April 30, 2024
Author: Ignite Healthwise, LLC Staff
Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
Current as of: April 30, 2024
Author: Ignite Healthwise, LLC Staff
Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
This information does not replace the advice of a doctor. Ignite Healthwise, LLC, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.