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C-reactive protein (CRP) concentration, serum/plasma

Published: August 9, 2026Updated: August 16, 2026

This test measures the level of C-reactive protein, a protein produced by the liver in response to inflammation in your body.

Quick summary

["CRP helps doctors assess inflammation, often used to monitor conditions like infections, autoimmune diseases, or heart disease risk."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
26723-7
Short code
VZV Ab Titr CSF IF
Synonyms
VZV Ab Titr CSF IF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 healthcare provider may order this test to check for signs of inflammation, monitor chronic conditions (like arthritis or heart disease), or evaluate responses to treatments. It can also help diagnose infections or identify risks for conditions like heart attacks or stroke.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into a vein (usually in your arm) to draw blood. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

Results are interpreted based on your overall health and symptoms. Higher levels may indicate inflammation, infection, or other health issues. Your provider will discuss the meaning with you.

Common Conditions Monitored

CRP is often used to track conditions like rheumatoid arthritis, lupus, heart disease, or infections. It can also help gauge how well treatments are working.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

C-reactive protein is a marker for systemic inflammation. Elevated levels may signal infections, autoimmune disorders, or conditions like cardiovascular disease. It’s not diagnostic on its own but supports broader clinical decisions.

Short name

CRP (Serum/Plasma)

Frequently asked questions

What causes CRP levels to rise?
CRP levels can increase due to infections (like pneumonia or urinary tract infections), injuries, surgeries, or certain medications. Chronic conditions like arthritis or heart disease may also lead to higher CRP over time.
How often should I get this test?
Your provider will determine the frequency based on your health needs. Some people get it yearly to monitor heart disease risk, while others may need it more often if they have active inflammation or a chronic condition.
Can diet or exercise affect CRP levels?
Yes! Lifestyle factors like diet (e.g., Mediterranean diet), exercise, and weight management can lower CRP levels. Smoking and poor sleep may raise them, so small changes can help.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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