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C-reactive protein (CRP) by nephelometry

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

This test measures a protein produced by your liver in response to inflammation, helping doctors assess low-level inflammation in your body.

Quick summary

["High CRP levels may signal inflammation, which can be linked to infections, autoimmune conditions, or other health concerns."]

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

Key facts at a glance

LOINC
38279-6
Short code
LPT 2.5 ug/mL CA Bld-aCnc
Synonyms
LPT 2.5 ug/mL CA Bld-aCnc
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Ref low
0.8
Ref high
1.2
Critical range
— – 5 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85610
SNOMED
396252006
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Healthcare providers may order a high-sensitivity CRP test to monitor chronic conditions like heart disease, rheumatoid arthritis, or other inflammatory diseases. It can also help track response to treatment or detect early signs of inflammation after an injury or surgery.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm to draw blood, which is then sent to a lab for analysis. If you’re on blood thinners, discuss this with your provider first.

What the Results Mean

Results are reported in milligrams per liter (mg/L). Higher-than-normal levels may indicate inflammation, while very low levels might suggest reduced inflammation. Your provider will interpret results in the context of your overall health.

Common Conditions Monitored

This test is often used to evaluate conditions like cardiovascular risk, autoimmune disorders, or infections. It can also help guide decisions about treatments for conditions such as atherosclerosis or inflammatory bowel disease.

Reference range

INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A

Specimen: whole-blood

Inform your healthcare provider if you are taking blood thinners. No special preparation required.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: CRP as an Inflammatory Marker

Short name

CRP (High-Sensitivity)

Frequently asked questions

How often will I need this test?
The frequency depends on your condition and treatment plan. Your healthcare provider will determine how often you need follow-up tests, such as every few months or annually, based on your needs.
Can diet or exercise affect CRP levels?
Yes, lifestyle factors like diet, exercise, and stress can influence CRP levels. Eating a heart-healthy diet, staying active, and managing stress may help lower inflammation over time.
What if my CRP levels are elevated?
If your CRP levels are elevated, your provider may recommend further testing or adjustments to your treatment plan to address the underlying cause of inflammation, such as infections, autoimmune activity, or other health issues.
  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