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Fluoroquinolone (Fluoroquinolone) Antimicrobial Resistance Screening in Serum/Plasma

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

This test checks for the presence of bacterial resistance to fluoroquinolone antibiotics, commonly used to treat infections like urinary tract infections, respiratory infections, or certain types of pneumonia.

Quick summary

["Helps determine if bacteria may not respond to fluoroquinolone antibiotics, guiding treatment choices."]

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

Key facts at a glance

LOINC
109695-7
Short code
FLUAV Ag Msmt Nose
Synonyms
FLUAV Ag Msmt Nose
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Might Be Ordered

Your healthcare provider may recommend this test if you have an infection that hasn’t improved with fluoroquinolone treatment, or if you’re considering this antibiotic for a specific infection. It’s also used in research or clinical settings to monitor resistance patterns in bacteria.

What to Expect Before the Test

No special preparation is needed. The blood sample is typically drawn from a vein in your arm. If you’re on fluoroquinolone antibiotics, discuss this with your doctor before the test, as it may affect results.

What the Test Measures

This test detects genetic markers in bacteria that indicate resistance to fluoroquinolone antibiotics. These markers can be found in samples like serum or plasma, which are parts of your blood.

How the Test Results Are Used

Results help healthcare providers decide whether to continue, adjust, or switch antibiotic treatments. It’s not a direct measure of your infection status but helps guide broader treatment strategies.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Fluoroquinolone Resistance Screen

Frequently asked questions

What does a positive result mean?
A positive result suggests that the bacteria in question may have genetic markers linked to resistance to fluoroquinolone antibiotics. This doesn’t necessarily mean you have an infection with resistant bacteria, but it may influence treatment decisions.
Will I need to change my antibiotic treatment if the result is positive?
Possibly. Your healthcare provider will review the result alongside your clinical picture and other tests to determine the best course of action. They may recommend alternative antibiotics or other treatments.
Can this test be done on other specimens besides blood?
This test is primarily performed on serum or plasma samples, which come from blood. However, in some research or specialized settings, other specimens like urine may be analyzed for bacterial cultures and resistance testing.
  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