Serum/plasma concentration of moxifloxacin (antibiotic drug level)
This test measures the amount of the antibiotic moxifloxacin in your blood or serum/plasma. It helps doctors check if your dose is working properly and if you’re responding to treatment.
This test helps ensure your antibiotic dose is correct and monitors for potential side effects or drug resistance.
Key facts at a glance
- LOINC
- 73255-2
- Short code
- Moxifloxacin ind plt IgM SerPl Ql FC
- Synonyms
- Moxifloxacin ind plt IgM SerPl Ql FC
- Category
- hematology
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- flow-cytometry
- 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 moxifloxacin to treat infections like pneumonia, skin infections, or urinary tract infections. It helps assess whether the drug is at an effective level in your blood to fight bacteria without causing harmful side effects.
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 blood, or a blood sample may be collected from an artery. If you’re taking moxifloxacin regularly, your doctor may request samples at specific intervals (e.g., 1–2 hours after dosing).
What the Results Mean
Results show the concentration of moxifloxacin in your blood. Low levels may mean the drug isn’t working well, while very high levels could indicate side effects or improper dosing. Your doctor will interpret these results in the context of your treatment plan.
Possible Causes of Abnormal Results
Abnormally low levels might suggest poor absorption, drug interactions, or incorrect dosing. High levels could indicate overdosage, kidney issues, or liver problems. Always discuss results with your healthcare provider.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is critical for monitoring antibiotic therapy. Low concentrations may mean the infection isn’t being fully treated, while high concentrations could signal toxicity or the need for dose adjustments. Doctors use these results to tailor treatment and avoid unnecessary risks.
Short name
Moxifloxacin Level
Frequently asked questions
Why do doctors check moxifloxacin levels in blood?
What happens if my moxifloxacin levels are too low?
Can food or other medications affect moxifloxacin test results?
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