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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 in your blood plasma, a marker often used to assess inflammation or infection.

Quick summary

["CRP helps doctors track inflammation, guide treatment, or check for infections."]

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

Key facts at a glance

LOINC
106842-8
Short code
Fact XIII Inhib PPP Chro-aCnc
Synonyms
Fact XIII Inhib PPP Chro-aCnc
Category
chemistry
Sample
plasma
Container
Lavender-top (EDTA) or Green-top (Heparin)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
chromo
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 Might You Need This Test?

Your doctor may order this test to monitor conditions like arthritis, heart disease, or infections. It can also help check how well your body is responding to treatment for inflammation or illness.

What Does a High or Low CRP Level Mean?

Elevated CRP levels often indicate inflammation or infection, but they can also be raised due to other conditions like autoimmune diseases or certain medications. Low levels may suggest reduced inflammation, but they don’t always mean you’re healthy.

How Is the Test Done?

A blood sample is taken from a vein, usually in your arm. The plasma is then analyzed to measure CRP levels using a sensitive detection method.

What Are Common Uses?

This test is commonly used to screen for infections, evaluate chronic inflammatory diseases, and monitor treatment progress in conditions like rheumatoid arthritis or heart disease.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

CRP is a non-specific marker that can be elevated in many inflammatory or infectious processes. While it helps guide decisions, it doesn’t diagnose a specific condition alone. Doctors may use it alongside other tests for a full picture.

Short name

CRP (Plasma)

Frequently asked questions

What does a CRP test tell me about my health?
A CRP test provides information about inflammation in your body but doesn’t diagnose a specific condition. It can help your doctor assess whether you have an infection, inflammation, or another underlying issue that may need treatment.
How often should I get a CRP test?
Your doctor will determine how often you need a CRP test based on your medical history, symptoms, and treatment plan. Regular monitoring may be needed if you have chronic conditions like arthritis or heart disease.
Can lifestyle changes affect CRP levels?
Yes, lifestyle factors like diet, exercise, and stress management can influence CRP levels. Reducing inflammation through healthy habits may lower CRP, but results vary among individuals.
  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