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Fluoroquinolone (e.g., ciprofloxacin) Concentration in Serum

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

This test measures the amount of fluoroquinolone antibiotics in your blood to ensure proper dosing and avoid toxicity.

Quick summary

["This helps doctors check if your antibiotic levels are safe and effective for your treatment."]

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

Key facts at a glance

LOINC
85533-8
Short code
FLUAV porcine NUC IgG/Pos cntrl Spec IA
Synonyms
FLUAV porcine NUC IgG/Pos cntrl Spec IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
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 doctor may order this test if you’re taking fluoroquinolone antibiotics (like ciprofloxacin) for a long-term infection, such as urinary tract infections, bacterial pneumonia, or certain types of gastrointestinal infections. It helps ensure the medication is working well and stays within safe levels in your bloodstream.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or vein to draw a blood sample. The process is quick and usually painless. If you’re on this medication, your doctor may ask you to stop taking it temporarily before the test for accurate results.

What the Results Mean

Results show the concentration of the antibiotic in your blood. Low levels may mean the medication isn’t working well, while very high levels could indicate toxicity. Your doctor will interpret these results in relation to your specific treatment plan.

Common Reasons for Testing

Doctors may test fluoroquinolone levels to monitor long-term use, adjust doses for kidney issues, or confirm the drug is effective against infections like urinary tract infections, respiratory infections, or gastrointestinal diseases.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Antibiotic Drug Level

Frequently asked questions

What could cause abnormal results?
Abnormally high levels may suggest overdose or improper dosing, while abnormally low levels could mean the infection isn’t fully treated. Kidney function, drug interactions, or improper timing of medication can also affect results. Always discuss your test results with your healthcare provider.
How long will I need to wait for results?
Results are typically available within 1–3 business days, depending on your lab. Your doctor will contact you with the findings once they’re ready.
Can I eat or drink before this test?
You can eat and drink normally unless your doctor instructs otherwise. Avoid caffeine or alcohol before the test, as they might affect blood composition.
  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