C-reactive protein (serum/plasma) concentration
This test measures the level of C-reactive protein, a protein made by your liver in response to inflammation in your body.
["CRP helps doctors assess inflammation, often used to monitor conditions like infections, autoimmune diseases, or after surgery."]
Key facts at a glance
- LOINC
- 111350-5
- Short code
- VZV IgG Msmt CSF
- Synonyms
- VZV IgG Msmt CSF
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 82784
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
What Is C-Reactive Protein Used For?
CRP is primarily used to detect inflammation in your body. High levels may signal infections (such as pneumonia or urinary tract infections), autoimmune conditions (like rheumatoid arthritis), or other inflammatory processes. It can also help track how well certain treatments are working or monitor recovery after procedures or injuries.
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 is analyzed to measure CRP levels using an immunoassay method, which detects the protein in your blood.
Why Might You Need This Test?
Your doctor may order a CRP test if you have symptoms of inflammation, such as fever, swelling, or unexplained pain. It may also be used in routine check-ups for people at higher risk of heart disease, or to monitor chronic conditions like arthritis or heart disease.
What Do My Results Mean?
Results are not given in absolute numbers because reference ranges can vary by lab and individual health. High CRP levels often indicate inflammation, while low levels suggest minimal or no inflammation. Your doctor will interpret results in the context of your overall health and medical history.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: CRP plays a key role in identifying and managing inflammatory conditions. Elevated CRP can prompt further investigation into infections, autoimmune diseases, or other underlying causes of inflammation. It is also a useful marker for monitoring chronic inflammatory diseases and guiding treatment decisions.
Short name
CRP
Frequently asked questions
How often should I get this test?
What are the possible side effects of having blood drawn?
Can lifestyle changes affect CRP levels?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy