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Serum or plasma mass concentration of C-reactive protein

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

This test measures the amount of C-reactive protein in your blood, a protein produced by the liver that rises in response to inflammation or infection.

Quick summary

["CRP helps doctors track inflammation, infections, or other health issues."]

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

Key facts at a glance

LOINC
58429-2
Short code
EDDP Ur Cfm-mCnc
Synonyms
EDDP Ur Cfm-mCnc
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
confirm
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
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 rheumatoid arthritis or heart disease, or evaluate infections such as pneumonia or appendicitis. It can also help assess how your body is responding to treatment for these conditions.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast before the test, but this depends on your doctor’s instructions. Bring any medications you’re taking to your appointment.

What Happens During the Test?

A healthcare professional will draw blood from a vein in your arm. You may feel a small pinch, but it usually doesn’t cause discomfort. The blood sample is then sent to a lab for analysis.

What Are the Results Mean?

Higher than expected levels of CRP may indicate inflammation, infection, or other health problems. Your doctor will interpret the results in the context of your medical history and other tests.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: C-reactive protein (CRP) is an acute-phase reactant that rises in response to tissue injury, infection, or chronic inflammatory conditions. Elevated CRP levels can signal underlying inflammation, guiding decisions on further testing or treatment adjustments.

Short name

CRP Mass Concentration

Frequently asked questions

What does a high CRP level mean?
A high CRP level may suggest inflammation or infection, but it doesn’t always point to a specific cause. Your doctor will review the results alongside other factors, like symptoms and medical history, to determine next steps.
Can CRP levels change with diet or exercise?
Yes, lifestyle factors like diet, exercise, and stress can influence CRP levels. Reducing inflammation through healthy habits may help lower CRP over time, but results depend on individual health.
Is CRP testing painful?
The blood draw itself is generally mild discomfort, but most people tolerate it well. If you’re anxious, let your healthcare provider know so they can prepare you accordingly.
  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