Understanding Laboratory Ranges for C-Reactive Protein (CRP)

Annular pentameric protein found in blood plasma whose circulating concentrations rise in response to inflammation.

C-reactive protein (CRP) is a protein produced by the liver in response to inflammation in the body. It is often used as a marker of inflammation or infection. When there is inflammation in the body, CRP levels increase. Therefore, a high level of CRP in the blood can indicate a variety of conditions, including infection, autoimmune diseases, cardiovascular disease, and even cancer.

What Do CRP Levels Mean?

CRP levels are measured in milligrams of CRP per liter of blood (mg/L). The normal range for CRP is typically less than 3.0 mg/L. However, the exact range can vary slightly depending on the laboratory that analyzes the blood sample.

• Low CRP Levels: A CRP level of less than 1.0 mg/L is considered low. This indicates a low level of inflammation in the body and is generally a good sign. However, it's important to note that even if your CRP levels are within the normal range, it does not necessarily mean you are free from disease. Some diseases may not cause an increase in CRP levels.

• Normal CRP Levels: A CRP level between 1.0 and 3.0 mg/L is considered average. This indicates a moderate level of inflammation in the body.

• High CRP Levels: A CRP level above 3.0 mg/L is considered high. This indicates a high level of inflammation in the body. High CRP levels can be a sign of a serious infection or other medical condition, such as heart disease. If your CRP level is high, your doctor will likely want to investigate further to determine the cause of the inflammation.

High-Sensitivity CRP Test

In addition to the standard CRP test, there is also a high-sensitivity CRP (hs-CRP) test. This test can detect lower levels of CRP than the standard test, making it useful for assessing the risk of cardiovascular disease.

• Low Risk: An hs-CRP level of less than 1.0 mg/L is considered low risk for cardiovascular disease.

• Average Risk: An hs-CRP level between 1.0 and 3.0 mg/L is considered average risk for cardiovascular disease.

• High Risk: An hs-CRP level above 3.0 mg/L is considered high risk for cardiovascular disease.

It's important to remember that CRP tests are just one piece of the puzzle. They should be used in conjunction with other tests and examinations to diagnose and monitor medical conditions. Always consult with your healthcare provider for a comprehensive understanding of your health.