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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, often used to check for signs of infection, injury, or other inflammatory conditions.

Quick summary

["CRP helps track inflammation levels in your body."]

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

Key facts at a glance

LOINC
44996-7
Short code
C trach B IgA Ser Ql
Synonyms
C trach B IgA Ser Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 Is This Test Done?

Your doctor may order this test to monitor conditions like infections, autoimmune diseases, or after surgery to see if inflammation is present or worsening. High levels may indicate an active infection or other inflammatory processes.

What Does the Result Mean?

Results are not provided with specific numeric ranges. Your healthcare provider will interpret the result in relation to your symptoms and medical history.

What Are Common Uses?

This test is commonly used in routine check-ups, to assess for early signs of inflammation, or to monitor chronic conditions like heart disease or rheumatoid arthritis.

How Is the Sample Collected?

A blood sample is drawn from a vein, usually in your arm. You may feel a small pinch when the needle is inserted, but it typically doesn’t cause significant discomfort.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP (High Sensitivity)

Frequently asked questions

Why might my CRP test be done frequently?
If you have a chronic condition like heart disease, arthritis, or other inflammatory diseases, your doctor may order CRP tests regularly to monitor your condition and adjust treatments as needed.
What can affect my CRP levels?
Factors like infections, injuries, stress, certain medications, or underlying health conditions can influence CRP levels. Smoking, obesity, and poor diet may also play a role.
Do I need to prepare for this test?
No special preparation is needed, but avoid strenuous exercise or consuming large amounts of alcohol 24 hours before the test.
  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