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

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

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

Quick summary

["CRP helps doctors assess 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
35492-8
Short code
MRSA DNA Spec Ql NAA+probe
Synonyms
MRSA DNA Spec Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Is C-Reactive Protein?

C-reactive protein (CRP) is a marker produced by your immune system when tissues are damaged or when you have an infection. It’s often checked alongside other tests to help identify inflammation in your body, which can signal conditions like infections, injuries, or certain diseases.

Why Might You Need This Test?

Your healthcare provider may order this test to monitor inflammation, check for infections, or assess risks for heart disease, especially if you have risk factors like high cholesterol or diabetes.

How Is the Test Performed?

A small amount of blood is drawn from a vein in your arm. The blood is processed to separate plasma, which is then tested for CRP levels using a specialized nephelometry method.

What Do the Results Mean?

Results are typically reported in milligrams per liter (mg/L). Higher levels may indicate inflammation, infection, or other health concerns, but interpretation depends on your overall health and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP (Plasma)

Frequently asked questions

Why was I asked to have this test?
Your doctor may have ordered this test to check for signs of inflammation, monitor a known condition, or assess your risk for heart disease or other health issues. It’s often used alongside other tests to get a clearer picture of your health.
What do my CRP results mean?
Your CRP results will be discussed with your healthcare provider, who will consider your symptoms, medical history, and other test results. Normal or low levels usually mean little to no inflammation, while higher levels may need further investigation.
Can I lower my CRP levels naturally?
Yes! Lifestyle changes like eating a balanced diet, staying active, managing stress, and avoiding smoking can help reduce inflammation. If you have a chronic condition, follow your doctor’s advice for managing it.
  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