Skip to content

C-reactive protein (CRP) by nephelometry (plasma)

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

This test measures the level of C-reactive protein, a protein produced by the liver in response to inflammation in your body.

Quick summary

["CRP helps doctors assess inflammation, often used to monitor conditions like infections, autoimmune diseases, or after surgery."]

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

Key facts at a glance

LOINC
35650-1
Short code
LCMV IgG+IgM Pnl CSF
Synonyms
LCMV IgG+IgM Pnl CSF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order a CRP test to check for signs of inflammation. This can help diagnose conditions like infections (e.g., pneumonia, urinary tract infections), autoimmune diseases (e.g., rheumatoid arthritis), or to monitor healing after surgery or injury. It may also be used to evaluate risk for heart disease or other chronic inflammatory conditions.

What to Expect Before the Test

No special preparation is needed for this test. You may have a blood sample drawn from a vein in your arm, similar to other blood tests. If you’re on blood thinners, let your provider know before the test.

What to Expect During the Test

The blood sample is taken in a sterile tube, usually while you sit comfortably. You might feel a slight pinch, but it’s quick and painless. The sample is then sent to the lab for analysis.

What the Results Mean

CRP levels vary depending on your health. Higher than normal levels may indicate inflammation, while lower levels suggest less inflammation. Your provider will interpret the results in the context of your medical history and other tests.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

CRP Plasma

Frequently asked questions

How often should I get this test?
The frequency depends on your condition. Some people get CRP tests regularly (e.g., every few months) to monitor chronic inflammation or heart disease risk. Others may need it only once for diagnosis or follow-up. Always follow your provider’s instructions.
Can diet or exercise affect CRP levels?
Yes! Certain foods (e.g., omega-3 fatty acids, anti-inflammatory herbs) or lifestyle changes (e.g., regular exercise, stress management) may lower CRP levels. Talk to your provider about how to support healthy inflammation levels.
What if my CRP is elevated?
If your CRP is elevated, your provider may recommend further tests (e.g., blood cultures, imaging) to find the cause of inflammation. Treatment could include medications, lifestyle changes, or addressing underlying conditions like infections or autoimmune disorders.
  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