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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 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
49066-4
Short code
WEEV IgG+IgM CSF-Imp
Synonyms
WEEV IgG+IgM CSF-Imp
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 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 to Expect Before the Test

No special preparation is usually needed. You may have blood drawn from a vein in your arm, similar to other blood tests. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

Higher CRP levels often indicate inflammation, but results alone don’t diagnose a specific condition. Your doctor will review your results alongside other symptoms and tests to determine next steps.

Common Conditions Monitored

CRP is commonly used to monitor conditions like rheumatoid arthritis, heart disease, infections (e.g., pneumonia), or to check healing after surgery or injury.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

CRP is a marker of systemic inflammation. While it doesn’t pinpoint the cause of inflammation, it helps guide treatment decisions and track disease activity in conditions where inflammation plays a role.

Short name

CRP (Plasma)

Frequently asked questions

How often should I get this test?
Your doctor will determine the frequency based on your health needs, such as monitoring chronic conditions or responding to treatment. Follow-up tests may be scheduled every few months or as needed.
Can diet or exercise affect CRP levels?
Yes, lifestyle factors like diet, exercise, and stress can influence CRP levels. Eating a heart-healthy diet, staying active, and managing stress may help lower inflammation over time.
What if my CRP levels are high?
High CRP levels may signal inflammation, but your doctor will investigate further with additional tests or questions about your symptoms. Treatment may include medications, lifestyle changes, or adjustments to your condition management plan.
  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