Lab test

CRP Test (C-Reactive Protein)

A C-reactive protein (CRP) test measures the amount of CRP in the blood, a protein the liver produces in response to inflammation.

Typical price

From $49

Results

1-3 business days

Preparation

See preparation notes below

Sample

Blood draw or sample collection at a local center

A C-reactive protein (CRP) test measures the amount of CRP in the blood, a protein the liver produces in response to inflammation. A higher level can accompany infection, injury, or inflammatory conditions. Clinicians order CRP to help detect whether inflammation or infection may be present and to monitor a known inflammatory condition over time. It is a general marker rather than a test for one specific disease.

• C-reactive protein (CRP) A liver-produced protein that rises with inflammation or infection.

• People with unexplained fever or persistent fatigue.
• Individuals with joint pain, swelling, or stiffness.
• Those being evaluated for infection or inflammation.
• People monitored for a known inflammatory condition.
• Anyone whose provider suspects hidden inflammation.

• No fasting is required for a standard CRP test.
• Avoid testing during an active infection if possible.
• Avoid strenuous exercise right before the draw.
• Tell the provider about recent illness and medications.
• A standard blood draw is used for the sample.

An elevated CRP can be associated with inflammation or infection from many causes, while a normal CRP is generally reassuring. Because CRP is nonspecific, it is interpreted with symptoms, other markers such as ESR, and additional testing. Results may rise and fall quickly as a condition changes. A single value does not identify the cause. Discuss your result with a healthcare provider.

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