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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 in your blood, a marker often checked to assess inflammation or infection.

Quick summary

["CRP helps doctors track inflammation, infection risk, or response to treatment."]

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

Key facts at a glance

LOINC
58760-0
Short code
EBV VCA IgG CSF IA-aCnc
Synonyms
EBV VCA IgG CSF IA-aCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order CRP testing to monitor conditions like arthritis, infections, or heart disease. It can also help check if an infection is spreading or if inflammation is worsening. In some cases, it’s used to guide treatment decisions, such as adjusting medications for autoimmune diseases.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw a blood sample. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

Higher CRP levels often indicate inflammation, infection, or other health issues. However, results alone don’t diagnose a condition—they’re used alongside other tests and symptoms. Your doctor will interpret the results in the context of your medical history and other findings.

Common Conditions Monitored

CRP is commonly used to track conditions like rheumatoid arthritis, inflammatory bowel disease, or heart problems. It may also be checked after surgery or injury to see how your body is healing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

CRP

Frequently asked questions

How often should I get this test?
The frequency depends on your health condition and treatment plan. Your doctor will determine how often you need testing, such as monthly, every few months, or as needed for monitoring.
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 is elevated but I don’t have symptoms?
Elevated CRP without symptoms could indicate silent inflammation, which might be linked to conditions like metabolic syndrome or early-stage autoimmune disease. Your doctor will investigate further with additional tests or evaluations.
  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