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Antibiotic (Ofloxacin) Drug Level, Serum/Plasma

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

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

Quick summary

["Helps doctors monitor your antibiotic dose for effective infection control."]

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

Key facts at a glance

LOINC
41410-2
Short code
Ofloxacin Islt Slgr Mcbct AB 4.0
Synonyms
Ofloxacin Islt Slgr Mcbct AB 4.0
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 ofloxacin to treat bacterial infections, such as urinary tract infections, respiratory infections, or skin infections. It helps ensure the drug is at the right level to fight the infection without causing harmful side effects.

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 blood. It usually takes a few minutes, and you may feel a brief pinch. If you’re on long-term treatment, your doctor may schedule regular tests to check levels over time.

What the Results Mean

Results help doctors adjust your dose if needed. Low levels may mean the infection isn’t fully treated, while very high levels could indicate side effects. Your doctor will discuss these findings with you.

Possible Side Effects or Risks

Antibiotics like ofloxacin can cause side effects such as nausea, stomach pain, or allergic reactions. Rarely, they may affect your nerves or kidneys. If you experience severe symptoms like rash, dizziness, or trouble breathing, seek medical help immediately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Ofloxacin Level

Frequently asked questions

How often should I get this test?
Typically, doctors check levels during active treatment (e.g., every few days) and then periodically while you’re still on the medication. Your doctor will determine the schedule based on your condition and response.
Can I drink water before the blood draw?
Yes, you can drink water unless your doctor specifies otherwise. Hydration helps with blood circulation but doesn’t interfere with the test results.
What if I miss a dose of ofloxacin?
If you miss a dose, take it as soon as possible unless it’s almost time for your next one. Never double the dose unless instructed by your doctor. Contact your healthcare provider to adjust your treatment plan if needed.
  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