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C-reactive protein (CRP) quantitative measurement by probe-based immunoassay

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

This test measures the amount of C-reactive protein in your blood, a marker often checked to assess inflammation or infection.

Quick summary

["CRP helps doctors track inflammation, infection risk, or response to treatment."]

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

Key facts at a glance

LOINC
45072-6
Short code
C trach+GC rRNA Anal Ql Probe
Synonyms
C trach+GC rRNA Anal Ql Probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe
CPT
86038
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 healthcare provider may order this test to check for signs of inflammation, monitor conditions like arthritis, heart disease, or infections, or evaluate how well you’re responding to treatment for these issues. It can also be used as a screening tool in certain situations.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into a vein (usually in your arm) to draw blood. If you’re concerned about needles, let your provider know so they can discuss alternatives.

What Happens During the Test?

A healthcare professional will collect a blood sample, which is then sent to a lab for analysis. The test typically takes a few minutes, and results may be available within 24–48 hours depending on your lab.

What Are the Results?

Results are reported in milligrams per liter (mg/L). Higher than expected levels may indicate inflammation, infection, or other health concerns, while lower levels may suggest reduced inflammation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CRP Level

Frequently asked questions

What does a high CRP level mean?
A high CRP level can signal inflammation or infection, but it doesn’t always point to a specific illness. It may help doctors assess whether you need further testing or treatment for conditions like arthritis, heart disease, or infections.
How often should I get this test?
Your doctor will determine how often you need this test based on your health needs, symptoms, or ongoing treatment. Some people get it yearly, while others may need it more frequently depending on their condition.
Can lifestyle changes affect CRP levels?
Yes, lifestyle factors like diet, exercise, and smoking can influence CRP levels. Reducing inflammation through healthy habits may lower CRP, but results may take time to show.
  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