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C-reactive protein (CRP) with probe-based immunoassay measurement

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

This test measures a protein produced by your body in response to inflammation, often used to check for signs of infection, injury, or other inflammatory conditions.

Quick summary

["CRP helps track inflammation levels in your blood."]

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

Key facts at a glance

LOINC
21598-8
Short code
VZV DNA CSF Ql NAA+probe
Synonyms
VZV DNA CSF Ql NAA+probe
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test to monitor conditions like infections (e.g., pneumonia, urinary tract infections), autoimmune diseases (e.g., rheumatoid arthritis), or to assess healing after surgery or injury. It can also help evaluate chronic conditions like heart disease or kidney problems.

What to Expect Before the Test

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

What the Results Mean

Higher CRP levels may indicate inflammation, but results alone don’t diagnose a condition. Your provider will compare your results with your symptoms and other tests.

Common Conditions Monitored

Elevated CRP is often seen in infections, injuries, or inflammatory diseases. Low or normal levels may suggest no active inflammation, but they don’t rule out all causes.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical significance: CRP is a sensitive marker for inflammation. While not specific to a single condition, it supports diagnosis or monitoring of inflammatory processes, infections, or post-treatment responses.

Short name

CRP (High-Sensitivity)

Frequently asked questions

What does a high CRP level mean?
A high CRP level suggests inflammation is present, which could be due to infection, an injury, or an autoimmune condition. Your provider will discuss this with you and may recommend further testing or treatment.
Does CRP change with diet or exercise?
CRP can be influenced by factors like diet, stress, or recent illness, but it’s not typically affected by regular physical activity. Your provider may ask about recent health events when reviewing results.
How often is this test repeated?
The frequency depends on your condition. Some patients get CRP checked monthly, while others may have it done less often, such as every few months or annually, to track changes over time.
  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