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C-reactive protein (CRP) by nephelometry

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

This test measures the level of C-reactive protein in your blood, a protein produced by your liver in response to inflammation.

Quick summary

["CRP helps identify inflammation, often used to monitor conditions like infections or autoimmune diseases."]

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

Key facts at a glance

LOINC
94853-9
Short code
WNV IgG+IgM Pnl CSF
Synonyms
WNV IgG+IgM Pnl 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 diagnose infections or assess risks for conditions like heart disease.

What to Expect During the Test

A small needle will be used to draw blood from a vein, usually in your arm. You may feel a slight pinch, but it usually doesn’t cause significant discomfort. The process takes a few minutes, and you can usually return to your normal activities immediately afterward.

Common Conditions Monitored

High CRP levels may indicate infections, autoimmune diseases (like lupus or rheumatoid arthritis), or inflammatory conditions. Low levels might suggest no active inflammation, but they don’t rule out other health issues.

Factors That Can Affect Results

Several factors can influence CRP levels, including recent infections, injuries, stress, smoking, or certain medications. It’s important to inform your healthcare provider about any recent illnesses or treatments.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP (Nephelometry)

Frequently asked questions

How long does it take to get my CRP test results?
Results are typically available within 24 to 48 hours, depending on your lab’s processing schedule. Your healthcare provider will contact you once they have the results.
Can I eat or drink before this test?
You can eat and drink normally before this test, as it doesn’t require fasting. However, always follow any specific instructions your healthcare provider gives you.
What if my CRP level is higher than expected?
A higher CRP level may suggest inflammation or infection. Your healthcare provider will review your results in the context of your overall health and may recommend further testing or adjustments to your treatment 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