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

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

This test checks for the presence of C-reactive protein, a marker often used to assess inflammation in your body.

Quick summary

["CRP helps identify inflammation, which may signal infections, injuries, or other health conditions."]

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

Key facts at a glance

LOINC
11483-5
Short code
VZV DNA Spec Ql NAA+probe
Synonyms
VZV DNA Spec Ql NAA+probe
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 This Test Might Be Ordered

Your healthcare provider may recommend this test to monitor inflammation, evaluate symptoms like fever, joint pain, or swelling, or check for conditions such as infections, autoimmune diseases, or response to treatment. It can also be used as a screening tool in certain situations.

What to Expect Before the Test

No special preparation is needed. You may have a blood sample drawn from a vein in your arm. If you’re on blood thinners, let your provider know before the test.

What the Results Mean

This test provides a qualitative result—meaning it tells whether CRP is present or not, rather than a specific amount. A positive result suggests inflammation is likely, but further testing may be needed to determine the cause.

Common Conditions Monitored

CRP is often used to track conditions like infections (e.g., pneumonia, urinary tract infections), inflammatory diseases (e.g., rheumatoid arthritis), or to check for signs of tissue damage or response to treatment.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP Qualitative Probe

Frequently asked questions

What does a positive CRP result mean?
A positive CRP result means your body is likely producing this protein due to inflammation. This could be caused by infections, injuries, autoimmune conditions, or other health issues. Your doctor will use this along with other factors to determine the next steps.
Can I eat or drink before this test?
You can eat and drink normally before this test unless instructed otherwise. Since it’s a blood draw, fasting isn’t required.
How long will it take to get my results?
Results are typically available within a few days, depending on lab processing times. Your doctor will discuss the findings with you during your follow-up visit.
  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