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C-reactive protein (CRP) by immunoassay (probe)

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

This test measures a protein in your blood that rises when your body is fighting inflammation or infection.

Quick summary

["High CRP levels may signal inflammation, which can help guide treatment for conditions like infections or autoimmune diseases."]

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

Key facts at a glance

LOINC
29248-2
Short code
VZV DNA Bld Ql NAA+probe
Synonyms
VZV DNA Bld Ql NAA+probe
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may order a high-sensitivity CRP test to monitor chronic conditions like arthritis, heart disease, or inflammation-related illnesses. It can also help check for signs of infection or inflammation after surgery or injury.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm to draw blood. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

Results are not given in absolute numbers but are compared to your baseline or clinical context. Elevated levels may indicate inflammation, while low levels suggest reduced inflammation.

Common Conditions Monitored

This test helps track conditions like rheumatoid arthritis, cardiovascular disease, or inflammatory bowel disease. It can also be used to assess response to treatments.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: CRP is a marker for systemic inflammation. High levels can signal acute infections, chronic diseases, or post-surgical healing responses. It’s often used alongside other tests to guide treatment decisions.

Short name

CRP (High-Sensitivity)

Frequently asked questions

What does a high CRP level mean?
A high CRP level often means your body is responding to inflammation or infection. Your doctor will consider your symptoms and other test results to determine the cause and next steps.
Can diet or exercise affect CRP levels?
Yes, lifestyle factors like diet, exercise, and weight can influence CRP levels. Reducing inflammation through healthy habits may lower CRP over time.
Is CRP the same as a general infection test?
No, CRP measures inflammation, not directly infections like bacteria or viruses. It’s often used alongside other tests, such as blood cultures or viral tests, for a full picture.
  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