- Bacterial infections, such as sepsis, a severe and sometimes life-threatening condition
- A fungal infection
- Inflammatory bowel disease, a disorder that causes swelling and bleeding in the intestines
- An autoimmune disorder such as lupus or rheumatoid arthritis
- An infection of the bone called osteomyelitis.
You may need this test if you have symptoms of a serious bacterial infection. Symptoms include:
- Rapid breathing
- Rapid heart rate
- Nausea and vomiting
If you’ve already been diagnosed with an infection or have a chronic disease, this test may be used to monitor your treatment. CRP levels rise and fall depending on how much inflammation you have. If your CRP levels go down, it’s a sign that your treatment for inflammation is working.
Note : A CRP test is sometimes confused with a high-sensitivity-(hs) CRP test. Although they both measure CRP, they are used to diagnose different conditions. An hs-CRP test measures much lower levels of CRP. It is used to check for risk of heart disease.
- Reference ranges : CRP is measured in milligrams per liter (mg/L). Results for a standard CRP test are usually given as follows:
- Normal: Less than 10 mg/L
- High: Equal to or greater than 10 mg/L
Note: Abnormal range values may vary depending on the laboratory doing the test. A high CRP test result is a sign of acute inflammation. It may be due to serious infection, injury or chronic disease. Your doctor will recommend other tests to determine the cause.
- Results for an hs-CRP test are usually given as follows:
- Lower risk of heart disease: hs-CRP level less than 2.0 mg/L
- Higher risk of heart disease: hs-CRP level equal to or greater than 2.0 mg/L