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Nonspecific inflammatory marker by immunoassay (C-reactive protein)

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

This test measures a protein in your blood that rises when your body is fighting infection or inflammation.

Quick summary

["CRP helps doctors track inflammation and guide treatment for infections, autoimmune conditions, or other health concerns."]

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

Key facts at a glance

LOINC
23293-4
Short code
M myc my sc DNA Spec Ql NAA+probe
Synonyms
M myc my sc DNA Spec 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

Your doctor may order this test to check for signs of inflammation, monitor conditions like arthritis, infections, or heart disease, or evaluate responses to treatments. It can also be used as a general health screening in some cases.

What to Expect Before the Test

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

What the Results Mean

Results are typically reported in milligrams per deciliter (mg/dL). Higher than normal levels may indicate inflammation, infection, or other health issues. Your doctor will interpret results based on your specific situation.

Common Conditions Monitored

Elevated CRP levels can signal conditions like rheumatoid arthritis, heart disease, infections (such as pneumonia or sepsis), or other inflammatory diseases. It’s not specific to one condition but helps guide overall health management.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP (Immunoassay)

Frequently asked questions

What does a high CRP level mean?
A high CRP level suggests your body is responding to inflammation or infection. Your doctor will review your symptoms, medical history, and other test results to determine the cause and next steps.
Can CRP levels change with diet or exercise?
Yes, lifestyle factors like diet, exercise, and stress can influence CRP levels. Reducing inflammation through healthy habits may lower CRP over time, but results depend on individual health and underlying conditions.
How often should CRP be checked?
Frequency depends on your health needs. Your doctor may recommend regular monitoring if you have chronic conditions like arthritis, heart disease, or other inflammatory disorders. Follow their guidance for timing and frequency.
  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