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C-reactive protein (CRP) measured by high-sensitivity nephelometry

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

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

Quick summary

["A simple blood test to check for subtle signs of inflammation, often used alongside other tests for early disease detection."]

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

Key facts at a glance

LOINC
87849-6
Short code
CTA PA-Bl + LE vv-Bl for PE+DVT
Synonyms
CTA PA-Bl + LE vv-Bl for PE+DVT
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct-angio
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 heart disease, autoimmune disorders, or infections where inflammation plays a role. It’s also used to check for signs of inflammation after surgery or injury.

How Is the Test Performed?

A small blood sample is taken from a vein in your arm. The blood is sent to a lab where it’s analyzed using a specialized machine to measure CRP levels precisely.

What Does the Result Mean?

Results are reported in milligrams per liter (mg/L). Higher than expected levels may indicate inflammation, but they can also be normal in some situations, like pregnancy or infection.

Common Conditions Monitored

This test helps track inflammation in conditions like coronary artery disease, rheumatoid arthritis, or after procedures like heart bypass surgery.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

hs-CRP (high-sensitivity C-reactive protein)

Frequently asked questions

What causes CRP levels to change?
CRP levels can rise due to infections (like colds or flu), injuries, surgeries, or certain medications. They may also be higher in people with chronic conditions like heart disease or arthritis.
How often should I get this test?
Your doctor will determine how often you need this test based on your health condition and symptoms. Some people get it every few months, while others may need it less often.
Can I eat or drink before this test?
You can usually eat and drink normally before this test unless your doctor specifies otherwise. No special preparation is needed, but avoid heavy meals just before the blood draw to ensure accuracy.
  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