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C-reactive protein (CRP) concentration in plasma

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

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

Quick summary

["CRP helps identify inflammation, often used to monitor conditions like infections, autoimmune diseases, or post-surgery recovery."]

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

Key facts at a glance

LOINC
45073-4
Short code
C trach+GC rRNA Tiss Ql Probe
Synonyms
C trach+GC rRNA Tiss Ql Probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe
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 this test to check for signs of inflammation, monitor chronic conditions like arthritis or heart disease, or evaluate your response to treatment. It can also help diagnose infections or assess risks after certain procedures.

What to Expect Before the Test

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

What the Results Mean

Higher than normal levels may indicate inflammation, infections, or certain diseases. Lower levels might suggest reduced inflammation. Your provider will discuss results in the context of your health.

Common Conditions Monitored

CRP is often used to track conditions like rheumatoid arthritis, heart disease, or infections. It can also help guide decisions about treatments or surgeries.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

C-reactive protein is a marker for inflammation. Elevated levels may signal underlying issues like infections, autoimmune disorders, or tissue damage. It’s not specific to one disease but helps guide overall health assessments.

Short name

CRP (Plasma)

Frequently asked questions

What causes CRP levels to rise?
CRP can increase due to infections (like pneumonia or urinary tract infections), injuries, surgeries, or certain medical conditions like arthritis or heart disease. Stress, smoking, or certain medications may also affect levels.
How often should CRP be checked?
Your provider will determine how often to check CRP based on your health needs. Some people get it tested yearly or more often if they have chronic conditions like heart disease or arthritis.
Can diet or lifestyle affect CRP levels?
Yes! Eating a healthy diet, staying active, and managing stress can help lower CRP levels. Avoiding smoking and limiting alcohol may also support better inflammation control.
  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