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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 rises when your body is responding to inflammation.

Quick summary

["CRP helps identify inflammation, often used to check for infections or other inflammatory conditions."]

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

Key facts at a glance

LOINC
107342-8
Short code
CMV DNA BAL Ql NAA+probe
Synonyms
CMV DNA BAL 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 Is Done

Doctors may order a CRP test to monitor conditions like infections (e.g., pneumonia, urinary tract infections), autoimmune diseases (e.g., rheumatoid arthritis), or after surgery to track healing. It can also help assess risk for heart disease or other inflammatory disorders.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw a blood sample. The test is quick and typically done in a lab setting.

What the Results Mean

Results are qualitative (yes/no) for screening. High CRP levels may indicate inflammation, but further testing is needed to determine the cause. Your doctor will discuss results in the context of your health history.

Common Conditions Monitored

CRP is often used to screen for or monitor conditions like infections, inflammatory diseases, or post-procedure inflammation. It’s not a diagnostic test alone but supports broader evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

CRP is a marker of inflammation, not a specific disease. Elevated levels can signal infections, autoimmune activity, or other inflammatory processes. While not diagnostic, it helps guide treatment decisions and monitor disease activity in chronic conditions.

Short name

CRP Screen

Frequently asked questions

How long does it take to get CRP test results?
Results are usually available within 1–3 business days, depending on lab processing times. Your doctor’s office will contact you once ready.
Can I eat or drink before this test?
No fasting is required for this blood test. However, always follow your doctor’s instructions for any other tests you may have scheduled.
Is CRP testing painful?
The needle stick is brief but may cause mild discomfort. Most people tolerate it well, and the area may feel sore for a few hours afterward.
  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