C-reactive protein (CRP) by nephelometry
This test measures the level of C-reactive protein in your blood, a protein produced by your liver in response to inflammation or infection.
["CRP helps track inflammation, guiding treatment decisions for conditions like infections or autoimmune diseases."]
Key facts at a glance
- LOINC
- 24314-7
- Short code
- TORCH 1996 Pnl Ser
- Synonyms
- TORCH 1996 Pnl Ser
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why Is This Test Done?
Your healthcare provider may order a CRP test to monitor inflammation, check for infections, evaluate autoimmune conditions, or assess risk for heart disease. It’s often used alongside other tests to guide treatment plans.
What to Expect Before the Test
No special preparation is usually needed. You may be asked to fast before the test, but this depends on your provider’s instructions. Bring any medications you’re taking to your appointment.
During the Test
A healthcare professional will draw blood from a vein in your arm. The process is quick and typically causes minor discomfort. You may feel a slight pinch or pressure during the draw.
After the Test
You can resume your normal activities immediately. Apply gentle pressure to the site to stop any bleeding, and avoid rubbing or picking at the area. Check with your provider if you experience excessive bruising or swelling.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
CRP (Nephelometry)
Frequently asked questions
CRP levels can rise in response to infections (like pneumonia or urinary tract infections), injuries, or inflammatory conditions (such as rheumatoid arthritis). High levels may indicate an ongoing inflammatory process, while consistently low levels suggest minimal inflammation. It’s not a standalone test for diagnosing conditions but often used alongside other tests for a clearer picture.
A high CRP level often signals inflammation or infection. Your provider may use the results to adjust treatment, such as increasing antibiotics for an infection or modifying medications for an autoimmune condition. However, other factors, like stress or certain medications, can also affect CRP levels.
Yes, diet and lifestyle can influence CRP levels. Certain foods, like those high in omega-3 fatty acids (found in fish and flaxseeds) or anti-inflammatory spices (like turmeric), may help lower CRP. Regular physical activity and maintaining a healthy weight are also important for managing inflammation.
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