Pathology Laboratory

What is C Reactive Protein?

Last updated on January 21st, 2023 at 12:00 pm

C-reactive protein (CRP) is an inflammatory marker used to diagnose infection or inflammation. It is also associated with cardiovascular disease risk.

C Reactive Protein (CRP) is a substance produced by the liver in response to inflammation.

What is C reactive protein?

C-reactive protein (also known as CRP) is a protein that increases in response to inflammation. High levels of this protein indicate increased risk for heart attack and strok.

Other names for CRP are high-sensitivity C-reactive protein (hs-CRP) and ultra-sensitive C-reactive protein (us-CRP).

A high level of CRP in the blood is a marker of inflammation. It can be caused by a wide variety of conditions, from infection to cancer.

High CRP levels can also show that there’s inflammation in the arteries of the heart, which can mean a higher risk of a heart attack. However, the CRP test is an extremely nonspecific test, and CRP levels can be elevated in any inflammatory condition.

C reactive protein test or CRP Test

Doctors may refer to this test with other tests to assess a person’s risk of heart disease or stroke. There is also new research that suggests CRP may be used as a predictor in health outcomes related to chronic obstructive pulmonary disease (COPD). High cholesterol is a more commonly cited risk factor. Hs-CRP may play a role in the development of type 2 diabetes. Doctors may also order a CRP test to diagnose inflammatory autoimmune diseases, including:

A Introduction to the Pathology Laboratory

C reactive protein and heart disease

Elevated levels of CRP may have an important role in identifying those who might need closer follow-up or more intensive treatment after heart attacks or heart procedures.

CRP levels may also be useful in uncovering those at risk of heart disease, where cholesterol levels alone may not be helpful.

Doctors consider these conditions significant risk factors for developing heart disease:

A family history of heart disease also puts you at a higher risk of heart disease.

C reactive protein normal range

C-reactive protein is measured in milligrams of CRP per litre of blood (mg/L). A low C-reactive protein level is better than a high one, because it shows less inflammation in the body.

  • A reading of less than 1 mg/L shows you’re at low risk of cardiovascular disease.
  • A reading between 1 and 2.9 mg/L means you’re at intermediate risk.
  • A reading greater than 3 mg/L means you’re at a high risk of cardiovascular disease.
  • A reading above 10 mg/L may signal a need for further testing to determine the cause of such significant inflammation in your body.

Note: The result varies in measuring units. Please check local laboratory measuring units.

High C-reactive protein reading may show:

  • a bone infection, or osteomyelitis
  • an autoimmune arthritis flare-up
  • IBD
  • tuberculosis
  • lupus, connective tissue disease, or other autoimmune diseases
  • cancer, especially lymphoma
  • pneumonia or other significant infection
C reactive protein test precautions

Note that CRP levels may also be elevated for those taking birth control pills. However, other markers of inflammation aren’t necessarily abnormal in these individuals.

Elevated CRP values in pregnancy may be a marker for complications, but more studies are necessary to understand the role of CRP and pregnancy.

If you’re pregnant or have any other chronic infection or inflammatory disease, a CRP test is unlikely to assess your risk of heart disease.

Before having a CRP test, speak to your doctor about any medical conditions that may skew the test results. Since there are other blood tests that can be performed instead, you might wish to forego a CRP test altogether.

Remember that this test doesn’t provide a complete picture of your risk of cardiovascular disease. Your doctor will consider your lifestyle risk factors, other medical conditions, and family history when determining which follow-up tests are best for you.

They may also order one of the following tests:

  • electrocardiogram (ECG)
  • echocardiogram (2D ECHO)
  • stress test
  • CT scan of the coronary arteries
  • heart catheterization
How does a high level of c reactive proteins affect my health?

Elevated levels of CRP are associated with increased risk for coronary artery disease, congestive heart failure, peripheral arterial disease, and cerebrovascular disease. This means that people who have high levels of CRP are at greater risk for developing these diseases.

What is the normal level of c reactive protein?

The American Heart Association recommends that people who want to reduce their risk of cardiovascular disease should keep their CRP level below 1 mg/L. If your CRP level is above 3 mg/L, then you should talk to your doctor about ways to lower it.

Learn about Insulin test

All material copyright healthcare nt sickcare. Terms and conditions and Privacy Policy of use. The contents are for informational purposes only. Always seek the advice of your physician or other qualified health providers with questions you may have regarding a medical condition. Source: various online articles and our own offline experiences inspired this article. The content is meant for public awareness and regular posts to the clientele of healthcare nt sickcare.

©healthcare nt sickcare and, 2017-Till Date. Unauthorised use and/or duplication of this material without express and written permission from this site’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full credit is given to healthcare nt sickcare and with appropriate and specific direction to the original content.

Credit VivekNNair by

About healthcare nt sickcare

healthcare nt sickcare connects the major health ecosystem, patients, doctors, diagnostics, and other partners, to generate exceptional value and service for all, esp. The end-receivers (patients). We integrate different parts of the healthcare journey and put them together end-to-end on our platform so that patients can have one seamless healthcare experience, irrespective of their needs.

Item added to cart.
0 items - 0.00