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C-reactive protein, serum/plasma concentration

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

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

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
36086-7
Short code
CT Abd Ltd
Synonyms
CT Abd Ltd
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct
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 a CRP test to check for signs of inflammation, infection, or other health conditions like heart disease, autoimmune disorders, or after surgery or injury. It can also help monitor treatment progress for conditions like arthritis or infections.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into a vein in 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 rise with stress, illness, or certain medications. Your provider will interpret results in the context of your overall health and symptoms.

Common Conditions Monitored

CRP is used to monitor conditions like rheumatoid arthritis, infections (e.g., pneumonia), heart disease, or to check for early signs of inflammation after procedures.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: CRP is a marker for systemic inflammation. Elevated levels may signal infections, autoimmune diseases, or other inflammatory processes, guiding treatment decisions or identifying risks for conditions like cardiovascular disease.

Short name

CRP (Serum/Plasma)

Frequently asked questions

Will I feel pain or discomfort during the blood draw?
You might feel a slight pinch or sting when the needle is inserted, but most people describe it as mild. Afterward, you may have a small bruise or soreness at the site.
How long will it take to get my results?
Results are typically available within 1–3 business days, depending on lab processing times. Your provider will discuss them with you.
Can I eat or drink before this test?
You can eat and drink normally before the test unless your provider instructs otherwise. No fasting is required for this blood test.
  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