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C-reactive protein (CRP) concentration in serum/plasma

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

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

Quick summary

["CRP helps identify and monitor inflammation in your body."]

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

Key facts at a glance

LOINC
59183-4
Short code
EBV EA-D IgG Ser Ql
Synonyms
EBV EA-D IgG Ser Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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

Why Is This Test Done?

Your healthcare provider may order this test to check for signs of inflammation, monitor conditions like infections, autoimmune diseases, or heart disease, or evaluate responses to treatments.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into a vein (usually in your arm) to draw a blood sample. If you’re worried about needles, let your provider know.

What Does the Test Result Mean?

Higher than expected levels may suggest inflammation, infection, or other health issues. Lower levels might indicate no active inflammation. Your provider will discuss results in the context of your overall health.

Common Conditions Monitored

CRP is often used to track conditions like rheumatoid arthritis, lupus, heart disease, or infections such as pneumonia or appendicitis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

CRP is a marker for inflammation and can help guide treatment decisions, though it’s not definitive on its own. Elevated levels may prompt further testing or adjustments to care plans.

Short name

CRP

Frequently asked questions

What causes CRP levels to be high?
Elevated CRP can result from infections (like flu or urinary tract infections), injuries, surgeries, or certain medical conditions (like autoimmune diseases). Stress or recent illness may also temporarily raise levels.
How often should I get this test?
Your provider will determine the timing based on your symptoms, diagnosis, or treatment plan. Some people get it monthly, others less frequently—always follow their advice.
Can diet or exercise affect CRP levels?
Yes! Reducing inflammation through diet (e.g., Mediterranean diet), exercise, and avoiding smoking can lower CRP levels over time. Your provider may recommend lifestyle changes if needed.
  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