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Serum Concentration of Ofloxacin (Antibiotic Level)

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

This test measures the amount of the antibiotic ofloxacin in your blood to check how your body is responding to treatment for an infection.

Quick summary

["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
72168-8
Short code
Ofloxacin Islt Slgr Mcbct AB 1.5
Synonyms
Ofloxacin Islt Slgr Mcbct AB 1.5
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

Your healthcare provider may order this test if you’re taking ofloxacin (a fluoroquinolone antibiotic) to treat or prevent infections like urinary tract infections, respiratory infections, or certain types of skin or bone infections. It helps monitor whether the medication is working as intended and to avoid potential side effects.

What to Expect Before the Test

No special preparation is usually needed. You may have a small needle inserted into your vein (venipuncture) to draw blood. If you’re nervous, let your provider know—they can offer ways to make it more comfortable.

What the Test Results Mean

Results show the concentration of ofloxacin in your blood. Low levels may mean the infection isn’t fully treated, while very high levels could indicate side effects or improper dosing. Your provider will interpret the results in relation to your specific situation.

Possible Side Effects or Considerations

Ofloxacin can cause side effects like nausea, dizziness, or stomach upset. Rarely, it may affect tendons, nerves, or the heart. If you experience severe symptoms (e.g., muscle weakness, vision changes, or irregular heartbeat), contact your provider immediately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Ofloxacin Level

Frequently asked questions

How long should I wait to get another test after finishing my ofloxacin prescription?
Typically, you’ll wait until your infection is fully resolved or symptoms improve before retesting. Follow your provider’s instructions, as they may recommend waiting 2–4 weeks or longer depending on the infection type.
Can I drink alcohol before or after taking ofloxacin?
Alcohol can increase the risk of side effects like nausea or dizziness. Avoid alcohol before and after your course of treatment unless your provider approves it.
What if my test results are outside the expected range?
If results are unusually high or low, your provider will review them with you. This could mean adjusting your medication, checking for other health conditions, or investigating if the infection is still active.
  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