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

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

["Helps track inflammation levels in your bloodstream."]

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

Key facts at a glance

LOINC
49348-6
Short code
CMV DNA # Amn NAA+probe
Synonyms
CMV DNA # Amn NAA+probe
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test to monitor conditions like arthritis, heart disease, infections, or to check for inflammation after surgery or injury. High-sensitivity CRP is particularly useful for detecting low-level inflammation that isn’t easily seen with other tests.

What to Expect Before the Test

No special preparation is needed. You’ll provide a small sample of blood drawn from your arm. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

Results are reported in milligrams per liter (mg/L). Higher levels may indicate inflammation, infection, or other health issues. Your doctor will interpret the results in the context of your overall health and symptoms.

Common Causes of Elevated CRP

Infections (bacterial, viral), autoimmune diseases (like rheumatoid arthritis), heart disease, kidney disease, or recent surgery or trauma can raise CRP levels. Low levels may suggest no active inflammation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: CRP is a marker for systemic inflammation. High-sensitivity CRP is especially useful for early detection of cardiovascular risks or monitoring chronic conditions. It’s not diagnostic on its own but often used alongside other tests for a full picture.

Short name

CRP (High-Sensitivity)

Frequently asked questions

What does a high CRP level mean?
A high CRP level suggests inflammation is present in your body, which could be due to infection, injury, or an autoimmune condition. Your doctor will review your results with other factors like symptoms and test results to determine the cause.
Can diet or exercise affect CRP levels?
Yes, lifestyle choices like diet, exercise, and smoking can influence CRP levels. Eating a heart-healthy diet, staying active, and avoiding smoking may help lower inflammation over time.
How often should I get this test?
Your doctor will decide how often to check your CRP based on your health needs. Some people get it yearly, while others may need it more frequently if they have ongoing conditions like heart disease or arthritis.
  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