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C-reactive protein (CRP) quantitative probe measurement

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

This test measures the level of C-reactive protein in your blood, a marker often used to assess inflammation or infection.

Quick summary

["CRP helps track inflammation, guiding treatment decisions for conditions like infections, autoimmune diseases, or heart health."]

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

Key facts at a glance

LOINC
42931-6
Short code
C trach rRNA Ur Ql NAA+probe
Synonyms
C trach rRNA Ur Ql NAA+probe
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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 This Test Is Done

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

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours if your blood is drawn early in the morning. Wear comfortable clothing for easy access to your arm.

How the Test Is Performed

A healthcare professional will draw blood from a vein in your arm using a small needle. You may feel a brief pinch, but the procedure is quick and usually painless. The blood sample is sent to a lab for analysis.

What the Results Mean

Results are interpreted based on your overall health and medical history. High CRP levels may indicate inflammation, while low levels suggest minimal or no inflammation. Your provider will discuss findings with you.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

CRP Level

Frequently asked questions

What does CRP measure?
CRP measures the amount of a protein produced by your liver in response to inflammation or infection. It’s a general marker that can help detect or monitor conditions like infections, autoimmune diseases, or heart disease.
How often should CRP be checked?
Your provider will determine how often to check CRP based on your health needs. Some people may need it yearly, while others may need it more frequently if they have ongoing conditions like arthritis or heart disease.
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 lower CRP, but results depend on individual health and medical treatment.
  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