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Fluoroquinolone Antibody Titration (Serum/Plasma)

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

This test measures the amount of antibodies your body produces in response to fluoroquinolone antibiotics, a class of medications used to treat bacterial infections. It helps assess immune response and potential drug interactions.

Quick summary

["Helps track immune reaction to fluoroquinolone antibiotics over time."]

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

Key facts at a glance

LOINC
5229-0
Short code
FLUAV Ab Titr Ser CF
Synonyms
FLUAV Ab Titr Ser CF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
comp-fix
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 This Test Is Done

Your healthcare provider may order this test if you’ve been treated with fluoroquinolone antibiotics and want to check how well your immune system is responding. It can also be used in research or specialized clinical settings to monitor antibody levels for drug efficacy or immune response studies.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for 8–12 hours before the draw if your blood is collected in the morning. Wear a loose shirt for easy access to your arm.

How the Test Is Performed

A healthcare professional will draw blood from a vein in your arm using a small needle. You may feel a brief pinch, but the procedure usually takes less than 5 minutes. The blood sample is then sent to a lab for antibody testing.

What the Results Mean

Results are reported as a numerical value representing antibody concentration (e.g., arbitrary units per milliliter). Higher values indicate a stronger immune response, while lower values may suggest insufficient antibody production. Your provider will interpret results in the context of your treatment and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Fluoroquinolone Antibody Level

Frequently asked questions

How does fluoroquinolone antibody testing differ from drug concentration tests?
This test measures antibodies (immune proteins) produced by your body, not the antibiotic itself. Drug concentration tests (e.g., for fluoroquinolones like ciprofloxacin) check the amount of medication in your bloodstream, while antibody tests assess immune response to the drug.
Can this test be used to determine if fluoroquinolone antibiotics are working?
While antibody levels can indicate immune response, they are not a direct measure of infection control. Antibiotics work by killing bacteria, not by boosting antibodies. Your provider may use clinical symptoms, culture results, or other tests to evaluate treatment effectiveness.
Is fasting required for this test?
No fasting is typically required for antibody testing, but some labs may ask for fasting depending on specimen handling. Always confirm with your healthcare provider or lab before your appointment.
  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