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

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

This test measures a protein produced by your liver in response to inflammation or infection. It helps track conditions like infections, autoimmune diseases, or inflammation.

Quick summary

["CRP helps monitor inflammation levels in your body."]

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

Key facts at a glance

LOINC
94828-1
Short code
EBV DNA Amn NAA+probe-aCnc
Synonyms
EBV DNA Amn NAA+probe-aCnc
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test to check for signs of inflammation, infections, or other health issues. High levels might suggest conditions like arthritis, heart disease, or infections, while low levels may indicate no active inflammation.

What to Expect Before the Test

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

What Happens During the Test?

A healthcare professional will collect a blood sample from your arm. The sample is then sent to a lab for analysis using a nephelometry method to measure CRP levels.

What Are Normal Results?

Results vary by lab, but high-sensitivity CRP is often measured in micrograms per milliliter (µg/mL). Your provider will compare your result to your health history and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: CRP plays a key role in detecting and managing inflammatory conditions. Elevated levels may signal acute infections, chronic diseases like rheumatoid arthritis, or cardiovascular risks. It’s also used to assess response to treatments.

Short name

CRP (High-Sensitivity)

Frequently asked questions

What does a high CRP level mean?
A high CRP level may indicate inflammation, infection, or an underlying condition like autoimmune disease. Your provider will review your symptoms and other test results to determine the cause.
Can diet or exercise affect CRP levels?
Yes, lifestyle factors like diet, exercise, and stress can influence CRP levels. Eating a balanced diet, staying active, and managing stress may help lower CRP levels over time.
How often should I get this test?
Your provider will decide how often to check your CRP levels based on your health needs. Regular monitoring may be needed if you have chronic conditions like heart disease or arthritis.
  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