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C-reactive protein (CRP) by turbidimetry

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

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

Quick summary

["CRP helps doctors assess inflammation in your body."]

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

Key facts at a glance

LOINC
17765-9
Short code
VZV IgG CSF IF-aCnc
Synonyms
VZV IgG CSF IF-aCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 doctor may order a CRP test to check for signs of inflammation, monitor conditions like infections, autoimmune diseases, or heart disease, or evaluate how well a treatment is working. It can also help identify risks for conditions like heart disease or certain cancers.

What to Expect Before the Test

No special preparation is needed for this blood test. You may have a small needle inserted into your arm to draw blood, which usually causes only minor discomfort. Avoid strenuous activity or eating heavy meals before the test if instructed by your doctor.

What the Results Mean

CRP levels vary depending on your health and medical history. Higher than normal levels may indicate inflammation, infections, or other health issues. Your doctor will interpret your results in the context of your overall health and medical history.

Common Conditions Monitored

CRP is often used to monitor conditions such as rheumatoid arthritis, lupus, heart disease, infections like pneumonia or sepsis, and to check for signs of inflammation after surgery or injury.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP

Frequently asked questions

What causes CRP levels to be high?
CRP levels can rise due to infections (like colds or flu), injuries, surgeries, autoimmune diseases (such as rheumatoid arthritis), heart disease, or other inflammatory conditions. Stress and certain medications can also temporarily affect CRP levels.
How often should I get this test?
Your doctor will determine how often you need a CRP test based on your medical needs. Some people may need it yearly, while others might have it more frequently if they have ongoing health conditions requiring monitoring.
Can diet or lifestyle affect CRP levels?
Yes, diet and lifestyle choices can influence CRP levels. Eating a heart-healthy diet, managing weight, exercising regularly, and reducing stress may help lower inflammation and CRP levels. Avoiding smoking and limiting alcohol can also support better health outcomes.
  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