C-reactive protein (CRP) by nephelometry

Why Is This Test Done?

Your healthcare provider may order a CRP test to check for signs of inflammation, infections (like pneumonia or urinary tract infections), or conditions such as autoimmune diseases (e.g., rheumatoid arthritis). It can also help monitor how well you’re responding to treatment for these conditions.

How Is the Test Performed?

A small blood sample is drawn from a vein, usually in your arm. The blood is then sent to a lab where it’s analyzed using nephelometry, a method that detects protein levels based on light scattering.

What Does a High or Low CRP Level Mean?

Elevated CRP levels often indicate inflammation or infection, but they can also be influenced by factors like stress, certain medications, or other health conditions. Low levels may suggest no active inflammation, but they don’t always mean you’re healthy.

Common Causes of Abnormal Results

High CRP levels can result from infections, autoimmune diseases, heart disease, or other inflammatory processes. Low levels might be normal, but they can also occur in people with chronic conditions or those on certain medications.