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C-reactive protein (CRP) in serum/plasma by nephelometry

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 track inflammation, often used to monitor conditions like infections, autoimmune diseases, or after injury."]

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

Key facts at a glance

LOINC
72494-8
Short code
CMV DNA SerPl NAA+probe-Log IU
Synonyms
CMV DNA SerPl NAA+probe-Log IU
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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. This could be due to suspected infections, autoimmune disorders (like rheumatoid arthritis), heart disease, or after surgery or trauma to monitor healing.

What to Expect During the Test

A small amount of blood is drawn from a vein, usually in your arm. You may feel a slight pinch, but it should not cause significant discomfort. The blood is then sent to a lab for analysis.

What the Results Mean

CRP levels can vary widely depending on your health status. Higher levels may indicate active inflammation, while lower levels suggest reduced inflammation. Your results will be interpreted by your healthcare provider in the context of your overall health and symptoms.

Common Conditions Monitored

CRP is often used to monitor conditions such as infections (like pneumonia or urinary tract infections), inflammatory diseases (like lupus or inflammatory bowel disease), and to assess cardiovascular risk.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP (Serum/Plasma)

Frequently asked questions

How long does it take to get CRP test results?
Results from a CRP test are typically available within 1 to 3 business days, depending on your lab’s processing times and whether it’s part of a routine panel or a standalone test.
Can I eat or drink before this test?
You can eat and drink normally before the test, as CRP levels are not affected by food or drink. However, always follow any specific instructions your healthcare provider gives you.
Is there any risk or discomfort with this blood test?
The blood draw itself is generally quick and may cause a slight pinch or bruising at the site. Most people experience minimal discomfort. Rarely, there may be minor swelling or redness around the needle site.
  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