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Acute-phase reactant protein serum/plasma concentration (e.g., C-reactive protein, fibrinogen, or other inflammatory marker)

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

This test measures certain proteins in your blood that rise when your body is responding to inflammation, infection, or injury.

Quick summary

["Your blood test helps track signs of inflammation or healing over time."]

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

Key facts at a glance

LOINC
99062-2
Short code
AChR Mod Ab Ser Ql FC
Synonyms
AChR Mod Ab Ser Ql FC
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
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

What This Test Measures

This test detects levels of proteins like C-reactive protein (CRP), fibrinogen, or others that increase during inflammation. These proteins are part of your body’s natural response to injury, infection, or illness.

Why It’s Done

Doctors may order this test to monitor conditions such as infections, autoimmune diseases, heart disease, or to check how your body is responding to treatment for inflammation or illness.

Common Uses

Results may help assess whether you’re healing, if an infection is spreading, or if certain treatments are working as expected.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast or avoid certain medications for a short time. Bring any recent medications to your doctor’s office.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated levels often indicate inflammation, infection, or tissue damage. Lower levels may suggest a reduced immune response or certain chronic conditions. Results are interpreted by your healthcare provider based on your full medical picture.

Short name

Inflammatory marker

Frequently asked questions

How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab’s processing time.
What does a high or low result mean?
High results may signal inflammation, infection, or other health issues. Low results could mean your body isn’t responding to inflammation as expected, though this varies by protein measured.
Can I eat or drink before this test?
Check with your doctor or lab for specific instructions, as some tests require fasting or avoiding certain foods/drinks.
  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