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C-reactive protein (CRP) by probe-based immunoassay (qualitative screening)

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

This test measures a protein called C-reactive protein (CRP) in your blood, which helps assess inflammation.

Quick summary

["CRP helps detect signs of inflammation, often used to monitor conditions like infections or autoimmune diseases."]

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

Key facts at a glance

LOINC
30247-1
Short code
CMV DNA # SerPl NAA+probe
Synonyms
CMV DNA # SerPl 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 Is Done

Doctors may order a CRP screen to check for signs of inflammation in your body. It can be used to monitor conditions such as infections, autoimmune diseases, or after surgery to see how your body is responding.

What to Expect Before the Test

No special preparation is needed for this test. You’ll typically have a small needle inserted into your arm to draw blood. If you’re nervous, let your healthcare provider know so they can help make it more comfortable.

What the Results Mean

This test is qualitative, meaning it provides a yes/no or positive/negative result rather than a specific number. A positive result suggests inflammation is present, but it doesn’t always pinpoint the cause.

Common Uses and Conditions

CRP screening is often used as a general marker for inflammation. It may be part of routine check-ups, especially in people at higher risk for heart disease or autoimmune conditions, or to monitor treatment progress.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

CRP Screen

Frequently asked questions

A positive CRP result indicates inflammation is likely occurring in your body, which can signal infections, injuries, or autoimmune responses. However, it doesn’t replace other tests needed to diagnose specific conditions.
This test is a screening tool and may not show the exact cause of inflammation. If your results are positive, your doctor may recommend further testing to identify the underlying issue.
How often should I get this test? Your doctor will determine the best timing based on your health needs and symptoms.
The frequency depends on your medical history and why the test was ordered. If you have chronic conditions like heart disease or arthritis, your doctor may suggest regular monitoring.
What does a high CRP level mean?
A positive CRP result means inflammation is present, but it doesn’t specify the cause. It’s often used alongside other tests to guide further evaluation.
  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