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C-reactive protein (CRP) with quantitative measurement in 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 identify inflammation, often used to monitor conditions like infections, autoimmune diseases, or after surgery."]

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

Key facts at a glance

LOINC
37212-8
Short code
CT Guided Epid Bx
Synonyms
CT Guided Epid Bx
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct
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 responses to treatments. It can also help diagnose infections or assess risks for conditions like heart disease.

What to Expect Before the Test

No special preparation is usually needed. You may fast before the test if instructed, but your provider will confirm. Bring any medications you’re taking, as some may affect results.

What Happens During the Test?

A small needle will draw blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The blood is sent to a lab for analysis.

What Do the Results Mean?

Results are interpreted by your healthcare provider based on your health history and symptoms. Higher levels may indicate inflammation, while lower levels suggest reduced inflammation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

C-reactive protein (CRP) is a marker for inflammation. Elevated levels can signal infections, autoimmune diseases, or other inflammatory conditions. It’s often used alongside other tests to guide treatment decisions, such as adjusting medications or planning further diagnostic steps.

Short name

CRP Level

Frequently asked questions

What causes CRP levels to be high?
CRP levels can rise due to infections (like colds or flu), injuries, surgeries, autoimmune diseases (like rheumatoid arthritis), or other inflammatory conditions. Stress, smoking, or certain medications may also 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 for monitoring, while others may need it more frequently if they have ongoing conditions.
Can diet or lifestyle affect CRP levels?
Yes, diet, exercise, and weight can influence CRP levels. Reducing processed foods, increasing fruits/vegetables, and maintaining a healthy weight may help lower inflammation 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