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C-reactive protein (CRP) 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 after surgery."]

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

Key facts at a glance

LOINC
34639-5
Short code
EBV VCA IgA Titr CSF
Synonyms
EBV VCA IgA Titr CSF
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 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 identify infections or other inflammatory processes in your body.

What Does a High or Low Level Mean?

Elevated CRP levels often indicate inflammation, which can be caused by infections, injuries, or certain medical conditions. Very low levels may suggest reduced inflammation, but they can also be normal in some individuals.

Sample Collection and Preparation

A blood sample is drawn from a vein, usually in your arm. The blood is then processed to separate serum or plasma, which is sent to the lab for testing. This test does not require fasting.

Common Conditions Monitored

CRP is commonly used to monitor conditions such as rheumatoid arthritis, lupus, heart disease, and infections like pneumonia or sepsis. It can also help track how well treatments are working.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP (Serum/Plasma)

Frequently asked questions

What causes elevated CRP levels?
Elevated CRP levels can be due to infections (like bacterial or viral), injuries, surgeries, or certain medical conditions such as autoimmune diseases (e.g., rheumatoid arthritis, lupus). Stress, smoking, and obesity can also influence CRP levels.
How often should I get this test?
The frequency depends on your medical condition and treatment plan. Your healthcare provider will determine how often you need this test based on your specific needs and symptoms.
Can diet or lifestyle affect CRP levels?
Yes, diet, exercise, weight management, and smoking habits can influence CRP levels. Reducing inflammation through healthy lifestyle choices may help lower CRP levels 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