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C-reactive protein (CRP) mass concentration 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 doctors assess inflammation, often used to monitor conditions like infections, autoimmune diseases, or heart disease."]

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

Key facts at a glance

LOINC
22192-9
Short code
C trach IgM CSF-aCnc
Synonyms
C trach IgM CSF-aCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 chronic conditions like arthritis or heart disease, or evaluate symptoms such as fever, pain, or swelling that might indicate infection or an immune response.

What to Expect During the Test

A small blood sample is taken from a vein, usually in your arm. You may feel a slight pinch, but it’s quick and doesn’t require special preparation. The sample is sent to a lab for analysis.

Common Uses and Conditions

CRP is commonly used to screen for infections, track progress in conditions like rheumatoid arthritis, or evaluate heart attack risk. It can also help guide treatment decisions for certain inflammatory diseases.

What the Results Mean

Results are not provided with specific ranges, as they depend on your health status and the reason for testing. High levels may suggest inflammation or infection, while low levels may indicate no active inflammation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP

Frequently asked questions

How often should I get this test?
Your doctor will determine how often you need this test based on your medical history, symptoms, and treatment plan. Follow-up tests may be scheduled every few months or as needed.
What do I need to do before the test?
No special preparation is usually needed, but avoid heavy meals or strenuous activity 1 hour before your appointment. If you’re on blood thinners or have a history of bleeding disorders, let your doctor know.
Can I eat or drink before the test?
You can eat and drink normally unless your doctor instructs otherwise. Some tests may require fasting, but CRP does not.
  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