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C-reactive protein (CRP) measured by nephelometry on serum/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 or infection in your body.

Quick summary

["CRP helps doctors track inflammation, infection, or risk of heart disease."]

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

Key facts at a glance

LOINC
9826-9
Short code
T palldm Ab CSF Ql IF
Synonyms
T palldm Ab CSF Ql IF
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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 doctor may order this test to check for signs of inflammation, monitor conditions like arthritis, heart disease, or infection, or evaluate how your body is responding to treatment for these conditions.

What Does the Test Measure?

CRP is a marker that rises when your body is fighting inflammation or infection. Higher levels may indicate conditions such as infections, autoimmune diseases, or other inflammatory processes.

Sample Collection and Preparation

A blood sample is taken from a vein in your arm. The blood is then processed into serum or plasma for testing. This test is typically done on fresh or stored samples using a specialized nephelometry method.

What Are Common Results and Ranges?

While specific reference ranges can vary by lab, CRP levels are often categorized as low (normal), moderate, or high depending on clinical context rather than a single numeric range.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP (Nephelometry)

Frequently asked questions

What does a high CRP level mean?
A high CRP level often suggests inflammation or infection in your body. This could be due to conditions like infections, autoimmune diseases, or other inflammatory processes. Your doctor will use the results along with other tests and symptoms to determine the cause.
Can CRP levels change with diet or lifestyle?
Yes, lifestyle factors such as diet, exercise, and smoking can influence CRP levels. Reducing inflammation through a healthy diet, regular physical activity, and avoiding smoking may help lower CRP levels.
How often should I get this test?
The frequency of this test depends on your medical condition and treatment plan. Your doctor will advise you on how often to get tested, whether it’s part of routine check-ups, monitoring a specific condition, or in response to symptoms.
  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