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C-reactive protein (CRP) mass concentration in serum

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 identify inflammation, often used to monitor conditions like infections or autoimmune diseases."]

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

Key facts at a glance

LOINC
26715-3
Short code
C trach IgG Ser IA-aCnc
Synonyms
C trach IgG Ser IA-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
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 symptoms such as fever, pain, or swelling. It can also help assess how well treatments are working.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into 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 CRP levels may suggest inflammation, infections, or other health issues. Lower levels might indicate no active inflammation. Your provider will discuss results in the context of your medical history.

Common Conditions Monitored

CRP is often used to monitor conditions like rheumatoid arthritis, heart disease, or infections. It can also help guide decisions about treatments or follow-up care.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

CRP levels can rise in response to infections, injuries, or autoimmune diseases. While it’s a useful marker, it doesn’t always pinpoint the exact cause of inflammation. Your provider will use results alongside other tests and symptoms to make a diagnosis.

Short name

CRP Serum

Frequently asked questions

What causes CRP levels to change?
CRP levels can increase due to infections (like pneumonia or urinary tract infections), injuries, surgeries, or certain medications. They may also rise with conditions like rheumatoid arthritis or heart disease. Stress or recent illness can temporarily affect results.
How often should I get this test?
Your provider will determine how often you need this test based on your health needs. Some people get it yearly, while others may need it more often if they have ongoing conditions.
Can diet or lifestyle affect CRP levels?
Yes, diet, exercise, and weight management can influence CRP levels. Eating anti-inflammatory foods (like fruits, vegetables, and omega-3s) and staying active may help lower CRP over time.
  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