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Moxifloxacin Substance Concentration in Serum/Plasma

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

This test measures the amount of the antibiotic moxifloxacin in your blood. It helps doctors check how well your body is responding to treatment.

Quick summary

["This test helps ensure your antibiotic dose is effective and safe."]

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

Key facts at a glance

LOINC
31039-1
Short code
Moxifloxacin Susc Islt
Synonyms
Moxifloxacin Susc Islt
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 Is This Test Done?

Your healthcare provider may order this test if you’re taking moxifloxacin (a fluoroquinolone antibiotic) to monitor your drug levels. It’s particularly useful for long-term use or when adjusting doses based on kidney function.

What Does the Test Involve?

A blood sample is taken from a vein in your arm. The sample is sent to a lab where it’s analyzed using a sensitive immunoassay method to detect moxifloxacin.

What Do Results Mean?

Results show the concentration of moxifloxacin in your blood at the time of testing. While reference ranges vary by lab, they’re used to guide dosing adjustments if needed.

What Are Possible Results?

Low levels may indicate insufficient antibiotic exposure, while very high levels could signal toxicity (e.g., nausea, headache). Your provider will interpret results in context of your treatment plan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test is critical for optimizing antibiotic therapy. Moxifloxacin is used to treat bacterial infections like pneumonia, skin infections, or sexually transmitted diseases. Monitoring levels helps prevent resistance or side effects, especially in patients with kidney issues.

Short name

Moxifloxacin Level

Frequently asked questions

Why might my doctor want to check my moxifloxacin levels regularly?
If you’re taking moxifloxacin for a long-term infection, have kidney problems, or are adjusting your dose, your doctor may order this test to ensure the drug stays effective without causing harm.
What should I expect after the blood draw?
You may feel slight bruising or discomfort at the injection site, but this usually fades quickly. Avoid strenuous activity for a few hours afterward to prevent bleeding.
Can I still take moxifloxacin if my test results are pending?
Yes, you should continue taking your prescribed dose as directed. Results will help your doctor confirm the right timing or dosage moving forward.
  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