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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 identify and monitor inflammation, often used to track conditions like infections, autoimmune diseases, or heart disease."]

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

Key facts at a glance

LOINC
88258-9
Short code
EC oppA gene Bld Pos Ql Probe
Synonyms
EC oppA gene Bld Pos Ql Probe
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
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 rheumatoid arthritis or lupus, or evaluate symptoms such as fever, joint pain, or swelling. It can also help assess the risk of heart disease or other inflammatory disorders.

What to Expect Before the Test

No special preparation is needed for this test. 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 CRP levels often indicate inflammation, but they can also be elevated due to infections, stress, or certain medications. Your provider will interpret results in the context of your overall health and symptoms.

Common Conditions Monitored

Elevated CRP is commonly seen in infections (like pneumonia or urinary tract infections), autoimmune diseases (such as lupus or rheumatoid arthritis), and conditions affecting the heart or blood vessels. It may also be used as a screening tool for certain cancers or inflammatory bowel diseases.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP (Nephelometry)

Frequently asked questions

What causes elevated CRP levels?
Elevated CRP levels can be caused by infections (such as bacterial infections), autoimmune diseases (like lupus or rheumatoid arthritis), heart disease, trauma, or certain medications. It’s important to discuss symptoms and medical history with your provider to determine the cause.
How often should I get this test?
The frequency depends on your medical condition and treatment plan. Your healthcare provider will determine how often to check CRP levels based on your needs, such as monitoring chronic inflammation or response to treatment.
Can diet or exercise affect CRP levels?
Yes, lifestyle factors like diet, exercise, and weight management can influence CRP levels. Eating a heart-healthy diet, staying active, and maintaining a healthy weight may help lower CRP levels, especially if you have inflammation-related conditions.
  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