C-reactive protein (CRP) – Serum Concentration
This test measures the level of C-reactive protein, a protein produced by your liver in response to inflammation or infection.
["CRP helps doctors assess inflammation in your body."]
Key facts at a glance
- LOINC
- 100692-3
- Short code
- VZV DNA CSF NAA+probe-Log#
- Synonyms
- VZV DNA CSF NAA+probe-Log#
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- probe-amp-tar
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
Why Is This Test Done?
Your doctor may order a CRP test to check for signs of inflammation, monitor conditions like arthritis, heart disease, or infections, or evaluate responses to treatments. It can also be used as a screening tool in certain situations, such as for cardiovascular risk assessment.
What to Expect Before the Test
No special preparation is needed for this blood test. You may be asked to fast for 8–12 hours before the draw if your doctor specifies it, but this is not always required. Bring your medical records or any medications you’re currently taking to your appointment.
What Happens During the Test?
A healthcare provider will draw blood from a vein in your arm using a small needle. You may feel a slight pinch, but the procedure usually takes only a few minutes. The blood sample is then sent to a lab for analysis.
What Are the Results?
Results are reported in milligrams per deciliter (mg/dL) or micrograms per milliliter (µg/mL). Higher than expected levels may indicate inflammation, infection, or other health issues, while lower levels may suggest no active inflammation. Your doctor will interpret the results in the context of your overall health.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated CRP levels often signal inflammation, which can be linked to conditions like autoimmune diseases (e.g., rheumatoid arthritis), infections, or chronic illnesses (e.g., heart disease). It’s also used to monitor treatment effectiveness or detect early signs of complications. However, CRP alone doesn’t diagnose a specific condition—it’s part of a broader evaluation.
Short name
CRP
Frequently asked questions
What Does a High CRP Level Mean?
How Often Should I Get This Test?
Can I Eat or Drink Before the Test?
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