CRP Test (C-Reactive Protein)
Below is a plain-language overview of the crp test (c-reactive protein). A C-reactive protein (CRP) test measures the amount of CRP in your blood. CRP is a protein your liver makes when there is inflammation somewhere in the body. Doctors order it to help detect or monitor inflammation from infection, injury, or chronic conditions.
- Sample type
- blood
- Category
- Inflammation
- Turnaround
- 1-3 business days
- Price
- $49
- Referral
- Not required
A C-reactive protein (CRP) test measures the amount of CRP in your blood. CRP is a protein your liver makes when there is inflammation somewhere in the body. Doctors order it to help detect or monitor inflammation from infection, injury, or chronic conditions.
What it measures
- C-reactive protein (CRP) — The main marker; higher levels generally mean more inflammation.
- High-sensitivity CRP (hs-CRP) — A more sensitive version used to assess cardiovascular risk.
- Reference range — The lab's expected range for a person without active inflammation.
Who it is for
A clinician may order a CRP test when you have symptoms such as fever, pain, or swelling, or to follow a known inflammatory condition. It is also sometimes used as part of heart risk assessment.
Preparation
No fasting is usually required for a standard CRP test. Tell your clinician about any recent illness, injury, or medications, since these can affect the result.
Results and what they mean
Results are reported as a number, often in milligrams per liter (mg/L), along with the lab's reference range. A clinician interprets your result together with your symptoms, history, and other tests. This is general information, not medical advice; discuss your results with a qualified healthcare professional.
How to order this test
- Choose the test and place a confidential order online.
- Select a certified collection site and pick a time that suits you.
- Have your specimen collected — most draws take only a few minutes.
- Review results in a secure portal, typically within 1–3 days.
Preparation, hours, and pricing vary by site; confirm details directly with the lab before your visit.
Availability by state
Direct-access online ordering for the crp test (c-reactive protein) is available in most states. It is currently unavailable in 6 states:
Everywhere else you can order confidentially and collect your sample at a certified site. Browse by state →
Frequently asked questions
Do I need to fast for a CRP test?
Usually no. A standard CRP test does not require fasting unless your clinician orders other tests at the same time.
What can cause a high CRP?
Infection, injury, autoimmune conditions, and other inflammatory states can raise CRP. A single result does not identify the cause.
Can CRP tell me if I have a specific disease?
No. CRP shows that inflammation is present but not where it is or what is causing it.
How long until I get results?
Typical turnaround is 1 to 3 business days, though it may vary by lab.