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

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

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

Quick summary

["CRP helps doctors assess inflammation, often used to monitor conditions like infections, autoimmune diseases, or after injury."]

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

Key facts at a glance

LOINC
109787-2
Short code
LCMV Ab Msmt CSF
Synonyms
LCMV Ab Msmt CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 healthcare provider may order this test to check for signs of inflammation, monitor chronic conditions like rheumatoid arthritis or lupus, or evaluate symptoms such as fever, joint pain, or swelling. It can also be used to monitor treatment effectiveness or detect infections.

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 the Results Mean

Higher than normal CRP levels often indicate inflammation or infection, but results alone don’t diagnose a specific condition. Your provider will interpret results in the context of your symptoms and medical history.

Common Conditions Monitored

This test is commonly used to monitor conditions like infections (e.g., pneumonia, urinary tract infections), autoimmune diseases (e.g., rheumatoid arthritis, lupus), heart disease, or after surgeries or injuries to track healing.

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 level tell me about my health?
A CRP level above the normal range suggests inflammation is present, but it doesn’t pinpoint the cause. Your provider may recommend further testing or adjustments to treatment based on the results.
Can CRP levels change with diet or exercise?
While diet and exercise can influence inflammation, CRP levels are primarily a marker of acute or chronic inflammatory processes. Small lifestyle changes may indirectly support overall health, but they won’t directly alter CRP test results.
Is CRP the same as a white blood cell count?
No, CRP is a protein produced by the liver in response to inflammation, while a white blood cell count measures the number of immune cells in your blood. Both tests are useful but serve different diagnostic purposes.
  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