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Antibiotic (Moxifloxacin) Concentration in Plasma

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

This test measures the amount of the antibiotic moxifloxacin in your blood plasma to assess its levels after you’ve taken it.

Quick summary

["This helps doctors check if your dose is working properly and adjusts it if needed."]

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

Key facts at a glance

LOINC
76045-4
Short code
Moxifloxacin Islt Slgr Mcbct AB 2.0
Synonyms
Moxifloxacin Islt Slgr Mcbct AB 2.0
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
method-for-slow-growing-mycobacteria-antibiotic-concentration-at-ug-ml
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

Doctors may order this test if you’re taking moxifloxacin (a fluoroquinolone antibiotic) to monitor its effectiveness, ensure safety, or confirm proper dosing. It’s especially important if you have kidney issues, are taking other medications, or if your doctor suspects resistance to the drug.

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. It usually takes a few minutes, and you may feel a brief pinch. If you’re on blood thinners or have a history of bleeding issues, let your doctor know.

What the Results Mean

Results are used to guide treatment decisions, such as adjusting your dose, switching medications, or confirming compliance. Your doctor will interpret these results in the context of your overall health and medical history.

Common Reasons for Testing

This test may be done to evaluate therapeutic drug levels, detect drug toxicity, assess compliance, or monitor for resistance to moxifloxacin in infections like pneumonia, urinary tract infections, or skin/soft tissue infections.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Moxifloxacin Level

Frequently asked questions

What Are My Next Steps?
Your doctor will discuss the results with you and may recommend further testing, changes to your medication, or additional follow-up. Always follow their guidance based on your specific situation.
How Long Will I Need to Wait for Results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Your doctor will contact you once they’re ready for review.
Can I Avoid This Test?
Not always. If your doctor prescribes moxifloxacin, they may order this test to ensure it’s working as intended. Skipping it could delay necessary adjustments to your treatment plan.
  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