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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 in your blood that rises when your body is fighting inflammation or infection.

Quick summary

["CRP helps doctors check for low-grade inflammation that may not show other symptoms."]

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

Key facts at a glance

LOINC
103191-3
Short code
M kansasii DNA Wnd Ql NAA+probe
Synonyms
M kansasii DNA Wnd 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 Is This Test Done?

Your doctor may order this test to monitor conditions like arthritis, heart disease, or inflammation-related illnesses. It can also help track how well treatments are working or detect early signs of infection.

What Does the Result Mean?

Higher-than-normal CRP levels may indicate inflammation, but they can also appear in response to other health issues. Your doctor will interpret results in relation to your symptoms and medical history.

How Is the Sample Collected?

A blood sample is taken from a vein, usually in your arm. You may feel a small pinch, but it won’t cause significant discomfort.

What Should You Do Before the Test?

Avoid strenuous activity or excessive stress 24 hours before testing, as these can sometimes raise CRP levels temporarily.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test plays a key role in assessing systemic inflammation, guiding treatment plans for chronic conditions, and identifying potential risks for conditions like cardiovascular disease or autoimmune disorders.

Short name

CRP (High-Sensitivity)

Frequently asked questions

What does a high CRP level mean?
A high CRP level suggests inflammation is present, but it doesn’t always point to a specific cause. Your doctor will consider other factors, like symptoms and medical history, to understand what’s happening in your body.
Can diet affect CRP levels?
Yes, diet can influence CRP levels. Eating a balanced diet rich in fruits, vegetables, and whole grains may help lower inflammation, while processed foods and excessive sugar can sometimes raise CRP.
How often should I get this test?
Your doctor will determine how often you need this test based on your health condition and treatment plan. Regular monitoring may be part of managing chronic illnesses like arthritis or heart disease.
  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