Moxifloxacin Concentration in Serum or Plasma
This test measures the amount of the antibiotic moxifloxacin in your blood, which helps determine if it’s working as intended and whether your dose needs adjustment.
["Moxifloxacin levels help ensure your antibiotic treatment is effective and safe."]
Key facts at a glance
- LOINC
- 31041-7
- Short code
- Moxifloxacin Islt KB
- Synonyms
- Moxifloxacin Islt KB
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- agar-diffusion
- 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’re taking moxifloxacin to treat or manage certain infections, such as respiratory, skin, or urinary tract infections. It may also be used to check for drug levels in patients with kidney issues or those taking other medications that interact with moxifloxacin.
What to Expect Before the Test
No special preparation is needed for this test. You may have blood drawn from a vein in your arm, similar to other blood tests. If you’re on a long-term course of moxifloxacin, your provider may ask you to fast for a few hours before the test to get more accurate results.
What the Results Mean
Results help doctors monitor whether your moxifloxacin levels are within the recommended range for your condition. Too little may mean the infection isn’t fully treated, while too much could increase side effects. Your provider will discuss these results with you in detail.
Possible Side Effects or Considerations
While rare, high moxifloxacin levels can sometimes cause side effects like nausea, dizziness, or allergic reactions. If you experience severe symptoms such as rash, difficulty breathing, or irregular heartbeat, seek medical attention immediately.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Moxifloxacin is a fluoroquinolone antibiotic used to treat bacterial infections. Monitoring its blood levels is particularly important in patients with kidney problems, those taking other medications that interact with it (like certain heart or blood pressure drugs), or those who are elderly. Proper dosing ensures the infection is treated effectively while minimizing risks of side effects or antibiotic resistance.
Short name
Moxifloxacin Level
Frequently asked questions
When might I need this test?
How long will it take to get my results?
Can I drink water before the blood draw?
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