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C-reactive protein (CRP) concentration, 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, which can signal infections, injuries, or other health conditions."]

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

Key facts at a glance

LOINC
107545-6
Short code
D crd & l vent crd Bld/T
Synonyms
D crd & l vent crd Bld/T
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order a CRP test to monitor conditions like infections (e.g., pneumonia, urinary tract infections), autoimmune diseases (e.g., rheumatoid arthritis), or to check for signs of inflammation after surgery or injury. It can also help evaluate heart disease risk or response to treatment.

What to Expect Before the Test

No special preparation is needed. You may have a blood sample drawn from a vein in your arm. If you’re on blood thinners, let your doctor know before the test.

What the Results Mean

CRP levels vary by individual and health status. Higher levels often indicate inflammation, but your doctor will interpret results in the context of your medical history and other tests.

Common Conditions Monitored

Elevated CRP may signal infections, autoimmune diseases, or chronic inflammation. Low levels might suggest no active inflammation, but they don’t rule out all conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

CRP is a useful marker for detecting and tracking inflammation-related conditions. While it doesn’t diagnose specific diseases, it helps guide treatment decisions and monitor disease activity in conditions like heart disease, arthritis, or infections.

Short name

CRP (Plasma)

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. Follow-up with your doctor to discuss findings.
Can diet or exercise affect CRP levels?
Diet high in anti-inflammatory foods (e.g., omega-3s, fruits, vegetables) may lower CRP, while processed foods or obesity can raise it. Exercise generally supports lower CRP levels, but results vary.
Is CRP the same as a complete blood count (CBC)?
No, CRP is a specific protein measure for inflammation, while a CBC checks red/white blood cells and platelets. Both tests serve different purposes in diagnosing health issues.
  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