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Antibiotic Concentration in Serum (Ofloxacin)

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

This test measures the amount of the antibiotic ofloxacin in your blood serum to check how well your body is responding to treatment for an infection caused by bacteria sensitive to this drug.

Quick summary

["This helps doctors determine if your dose needs adjustment for better infection control."]

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

Key facts at a glance

LOINC
20384-4
Short code
Ofloxacin Islt SlowMyco
Synonyms
Ofloxacin Islt SlowMyco
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
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 Matters for Your Treatment

Ofloxacin is often prescribed to treat bacterial infections like urinary tract infections, respiratory infections, or skin infections. Measuring its levels helps ensure you’re getting the right amount to fight the infection without causing unnecessary side effects.

What to Expect During the Test

A blood sample is taken from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The sample is then sent to a lab for testing.

How Results Are Used

Your doctor will compare your test results to what’s expected for your condition and treatment plan. Low levels might mean your dose needs to be increased, while high levels could signal you need a different medication or dosage adjustment.

Possible Side Effects or Considerations

While rare, high ofloxacin levels can sometimes cause nausea, dizziness, or allergic reactions. If you experience any unusual symptoms, talk to your doctor right away.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Regular monitoring of ofloxacin levels helps prevent antibiotic resistance, ensures the infection is properly treated, and minimizes risks of overuse or toxicity. It’s especially important for patients with kidney issues or those taking other medications that interact with antibiotics.

Short name

Ofloxacin Level

Frequently asked questions

How often will I need this test?
Your doctor will schedule follow-up tests based on your treatment plan, infection type, and response to the medication. Typically, tests are done during the early and later stages of treatment to track progress.
What if my test results are abnormal?
Abnormal results may prompt your doctor to adjust your medication, such as changing the dose, switching to a different antibiotic, or extending the treatment duration. They’ll discuss the next steps with you based on your specific situation.
Can I eat or drink before this test?
You can usually eat and drink normally before this test unless your doctor gives specific instructions. Blood tests don’t require fasting unless they’re checking for substances like glucose or lipids.
  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