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C-reactive protein (CRP) by nephelometry (serum/plasma)

Published: August 9, 2026Updated: August 16, 2026

This test measures the level of C-reactive protein, a protein made by your liver in response to inflammation or infection in your body.

Quick summary

["CRP helps doctors track inflammation, often used to check for infections or monitor conditions like arthritis or heart disease."]

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

Key facts at a glance

LOINC
22292-7
Short code
EBV VCA IgM Titr CSF
Synonyms
EBV VCA IgM 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 doctor may order this test to diagnose or monitor conditions like infections, autoimmune diseases (such as rheumatoid arthritis), or after surgery/injury to check for signs of inflammation. It can also help assess risk for heart disease or other inflammatory conditions.

What Does a High CRP Level Mean?

Elevated CRP levels often indicate inflammation. While it doesn’t pinpoint the cause, high levels can signal infections, injuries, or diseases like arthritis. Your doctor will consider other factors to interpret results.

What Does a Low CRP Level Mean?

Low CRP levels usually mean there’s little to no inflammation in your body. However, very low levels might raise concerns if you’re not experiencing symptoms of inflammation, so always discuss results with your healthcare provider.

Common Conditions Monitored With CRP

CRP is commonly used to monitor chronic conditions like rheumatoid arthritis, lupus, or heart disease. It may also be checked after procedures to ensure healing progresses as expected.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP (Nephelometry)

Frequently asked questions

What Does My CRP Test Result Mean?
Your CRP result will be compared to a general reference range, but exact values can vary by lab. Your doctor will explain what your specific result means in the context of your health and symptoms.
How Often Should I Get a CRP Test?
Your doctor will determine how often you need a CRP test based on your health needs. Some people get it yearly, while others may need it more frequently if they have ongoing conditions like arthritis or heart disease.
Can I Do Anything to Lower My CRP Levels?
Yes! Reducing inflammation may involve lifestyle changes like eating a balanced diet, staying active, managing stress, and avoiding smoking. If you have a chronic condition, follow your doctor’s advice for managing symptoms.
  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