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C-Reactive Protein (CRP) Test: About Your Child's Test

What is it?

This blood test measures the amount of C-reactive protein (CRP) in your child's blood. CRP levels rise when there is inflammation in your child's body.

Very high levels of CRP are caused by infections and many diseases. But other tests are needed to find the cause and location of the inflammation.

Why is this test done?

This test is used to:

  • Check for infection, including after surgery.
  • Find and keep track of infections and diseases that cause inflammation. These can include:
    • Inflammatory bowel disease. It causes long-term inflammation of the intestines.
    • Juvenile idiopathic arthritis. It causes inflamed, swollen joints.
    • Osteomyelitis. This is an infection of a bone.

How do you prepare for the test?

Most of the time, you don't need to do anything before your child has this test. Your doctor may give you some specific instructions.

How is the test done?

A health professional uses a needle to take a blood sample, usually from the arm.

How long does the test take?

The test will take a few minutes.

Follow-up care is a key part of your child's treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse advice line (811 in most provinces and territories) if your child is having problems. Ask your doctor when you can expect to have your child's test results.

Where can you learn more?

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