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Serum Concentration of Ciprofloxacin (Antibiotic Level)

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

This test measures the amount of the antibiotic ciprofloxacin in your blood. It helps doctors check if your dose is working properly and whether you need adjustments.

Quick summary

["This test helps ensure your antibiotic is at the right level to fight infection safely."]

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

Key facts at a glance

LOINC
20377-8
Short code
Ciprofloxacin Islt SlowMyco
Synonyms
Ciprofloxacin 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

Ciprofloxacin is a fluoroquinolone antibiotic used to treat bacterial infections. Your doctor may order this test if you’re taking ciprofloxacin to confirm your blood levels are within the recommended range. Low levels might mean the drug isn’t working well, while high levels could increase side effects.

What to Expect Before the Test

No special preparation is needed. You’ll likely have a simple blood draw from a vein in your arm. The test is usually done in a lab, and results are typically ready within a few days.

How the Test Works

Blood is collected and sent to a lab where it’s analyzed using a sensitive method to detect ciprofloxacin. The lab measures how much of the drug is present in your serum (liquid part of blood).

What the Results Mean

Results are compared to a target range set by your doctor based on your condition, weight, and other factors. If levels are too low, your doctor may adjust your dose or consider switching medications.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for patients on long-term ciprofloxacin therapy, those with kidney issues (since the drug is processed by the kidneys), or those who may be at higher risk for side effects. It helps balance effectiveness and safety.

Short name

Ciprofloxacin Level

Frequently asked questions

Why did my doctor order this test?
Your doctor may have ordered it to confirm your ciprofloxacin levels are appropriate for your infection, especially if you’re taking the medication for a prolonged period or have kidney problems.
What happens if my ciprofloxacin level is too high or too low?
Too high could increase side effects like nausea, dizziness, or tendon pain. Too low might mean the infection isn’t fully treated. Your doctor will discuss next steps based on your results.
Can I eat or drink before the test?
You can eat and drink normally unless instructed otherwise. Avoid caffeine or alcohol before the blood draw, as they might affect test results.
  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