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C-reactive protein (CRP) concentration, plasma

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

This test measures the level of C-reactive protein, a protein produced by your 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 surgery."]

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

Key facts at a glance

LOINC
109823-5
Short code
VZV IgM Msmt CSF
Synonyms
VZV IgM Msmt 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 This Test Might Be Ordered

Your healthcare provider may order this test to check for signs of inflammation, monitor chronic conditions like heart disease or arthritis, or evaluate responses to treatments. It can also help diagnose infections or identify risks for conditions like heart disease before symptoms appear.

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, but they can also be influenced by factors like stress, recent illness, or certain medications. Your provider will interpret results in the context of your overall health and symptoms.

Common Conditions Monitored

CRP is commonly used to monitor conditions such as rheumatoid arthritis, heart disease, or infections like pneumonia or sepsis. It can also help track how well treatments for inflammation are working.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP (Plasma)

Frequently asked questions

What does a high CRP level mean?
A high CRP level suggests inflammation is present in your body, which could be due to infections, injuries, autoimmune conditions, or other health issues. Your provider will discuss the results with you and may recommend additional tests or treatments based on the findings.
Can CRP levels change with diet or lifestyle?
Yes, lifestyle factors like diet, exercise, and stress can influence CRP levels. Eating a heart-healthy diet, managing stress, and staying physically active may help lower CRP levels over time, but results depend on your overall health and medical history.
Is CRP the same as a white blood cell count?
No, CRP is a different marker. CRP measures inflammation specifically, while a white blood cell count assesses the number of immune cells in your blood. Both tests can be useful, but they provide distinct information about your health.
  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