Skip to content

C-reactive protein (CRP) with high-sensitivity measurement via nephelometry (serum/plasma)

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

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

Quick summary

["High-sensitivity CRP can help track subtle inflammation that may not be obvious otherwise."]

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

Key facts at a glance

LOINC
38281-2
Short code
LPT 2.41 ug/mL TT Bld-aCnc
Synonyms
LPT 2.41 ug/mL TT 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 Is This Test Done?

Your healthcare provider may order this test to monitor chronic conditions like heart disease, arthritis, or autoimmune disorders. It can also help check for signs of infection or inflammation after surgery, injury, or during certain treatments.

What to Expect Before the Test

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

What the Results Mean

Results are not given as a single number but are compared to a reference range for your age and health status. Higher levels may indicate inflammation, while lower levels suggest reduced inflammation.

Common Conditions Monitored

Elevated CRP levels can signal conditions like cardiovascular disease, inflammatory bowel disease, or certain infections. Your provider will interpret results in the context of your medical history and symptoms.

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.

◆Associated findings1

Short name

High-sensitivity CRP (hs-CRP)

Frequently asked questions

What causes CRP levels to change?
CRP levels rise in response to infections, injuries, or inflammatory processes. They can also be influenced by age, genetics, and certain medications. Stress, smoking, or obesity may temporarily affect results.
How often should I get this test?
Your provider will determine the frequency based on your condition. For example, heart disease patients may get it every few months, while others may need it less often or only when symptoms appear.
Can diet or exercise affect CRP levels?
Yes, lifestyle factors like diet (e.g., Mediterranean diet), exercise, and weight management can lower CRP levels. Avoiding smoking and managing stress also play a role in reducing inflammation.
  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