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C-reactive protein (CRP) mass concentration in 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 in your body.

Quick summary

["CRP helps track inflammation, often used to monitor conditions like infections or autoimmune diseases."]

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

Key facts at a glance

LOINC
42572-8
Short code
11DC Ur-mCnc
Synonyms
11DC Ur-mCnc
Category
hormone
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
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 CRP testing to check for signs of inflammation, monitor chronic conditions (such as arthritis or heart disease), or evaluate responses to treatments. It can also help diagnose infections or assess risks for conditions like heart disease.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if it’s done on an empty stomach, but this is less common for CRP. Bring any medications or questions to your appointment.

How the Test Works

A small sample of blood is drawn from a vein, typically in your arm. The blood is sent to a lab where it’s analyzed to measure CRP levels using a sensitive detection method.

What the Results Mean

Results are reported in micrograms per milliliter (µg/mL) or milligrams per liter (mg/L). Higher than normal levels may indicate inflammation, infections, or other health issues. Your provider will interpret results in the context of your medical history and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

CRP is a marker for systemic inflammation. Elevated levels can signal infections (like pneumonia or urinary tract infections), autoimmune diseases (like rheumatoid arthritis), or other inflammatory conditions. It’s also used to assess cardiovascular risk, monitor treatment effectiveness, or guide decisions about further testing.

Short name

CRP

Frequently asked questions

How long does it take to get CRP test results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Your healthcare provider will discuss the findings with you during your follow-up visit.
Can CRP levels change with diet or exercise?
While diet and exercise can influence inflammation in the body, CRP levels alone don’t reflect overall health. Your provider will consider lifestyle factors alongside test results when making recommendations.
Is CRP testing painful?
The blood draw for CRP testing is generally mild discomfort for a few minutes, similar to a routine blood draw. Most people tolerate it well, and the area may feel slightly sore afterward. Ask your provider if you have concerns.
  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