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Quantitative measurement of Ciprofloxacin concentration in serum/plasma

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

This test checks how much of the antibiotic ciprofloxacin is in your blood or plasma. It’s often used to monitor drug levels, especially in people taking high doses or those with kidney issues.

Quick summary

["Monitoring antibiotic levels helps ensure you get the right dose and avoid side effects."]

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

Key facts at a glance

LOINC
18906-8
Short code
Ciprofloxacin Susc Islt
Synonyms
Ciprofloxacin Susc Islt
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 doctor may order this test if you’re taking ciprofloxacin (a fluoroquinolone antibiotic) at a dose that’s unusually high or if you have kidney problems. It helps them check if the drug is working properly and adjust your treatment if needed.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours before the blood draw if instructed by your healthcare provider. Bring any recent medications or supplements you’re taking.

What Happens During the Test

A healthcare professional will draw blood from a vein in your arm. You may feel a small pinch, but it usually doesn’t cause much discomfort. The blood sample is then sent to a lab for testing.

What the Results Mean

Results are typically reported as a concentration value (e.g., micrograms per milliliter). Your doctor will compare these numbers to your specific dose and medical needs to guide your treatment plan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

High levels of ciprofloxacin in the blood may indicate poor kidney function or incorrect dosing, which could lead to toxicity. Low levels might mean the drug isn’t working effectively, requiring adjustments to your treatment. This test helps balance safety and effectiveness in long-term use.

Short name

Ciprofloxacin Level

Frequently asked questions

Why might my doctor order this test?
Your doctor may order it if you’re taking ciprofloxacin for a long period, have kidney problems, or are receiving high doses. It helps ensure the drug stays at the right level in your body.
What does a ‘normal’ result mean?
There’s no single ‘normal’ range because it depends on your dose, kidney function, and other health factors. Your doctor will interpret the result based on your specific situation.
Can I eat or drink before the test?
Check with your doctor or lab about fasting requirements, but generally, you can eat lightly unless instructed otherwise. Avoid caffeine or alcohol before the blood draw if possible.
  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