Fluoroquinolone Antibiotic Level (Serum)
This test measures the amount of a fluoroquinolone antibiotic (such as ciprofloxacin or levofloxacin) in your blood. It helps doctors determine if the medication is working at the right level and if you need adjustments to your dose.
["Your antibiotic levels help ensure you get the right dose for effective treatment without unnecessary side effects."]
Key facts at a glance
- LOINC
- 39319-9
- Short code
- FLUAV N9 NAb Ser Ql Nt
- Synonyms
- FLUAV N9 NAb Ser Ql Nt
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- neut
- 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 a fluoroquinolone antibiotic for an infection, such as urinary tract, respiratory, or skin infections. It helps assess whether the medication is reaching the right concentration in your bloodstream to fight the bacteria effectively.
What to Expect Before the Test
No special preparation is needed. You may have a small needle inserted into your arm or vein to draw a blood sample. This is usually done in a lab or at a clinic. You might feel a brief pinch, but it’s quick and painless.
What the Results Mean
Results show the antibiotic’s concentration in your blood. High levels may indicate the drug is too strong, while low levels could mean the infection isn’t being treated well. Your doctor will interpret these results based on your specific condition and treatment plan.
Common Uses and Considerations
This test is often used to monitor long-term antibiotic therapy or when the infection is hard to treat. It’s also important if you have kidney problems, as these can affect how your body processes antibiotics.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Proper antibiotic levels help prevent resistance to medications, reduce side effects, and ensure the infection is fully treated. Low levels may require a higher dose, while very high levels could mean the drug isn’t needed or could harm your body. Your doctor will adjust your treatment based on these results.
Short name
Fluoroquinolone Level
Frequently asked questions
What does a normal or abnormal result mean?
How often should I get this test?
Can I eat or drink before the test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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