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Ciprofloxacin trough serum concentration

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

This test measures the amount of the antibiotic ciprofloxacin in your blood at its lowest point before the next dose, helping doctors monitor your treatment.

Quick summary

["This test ensures you’re receiving the right dose of ciprofloxacin to fight infections safely and effectively."]

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

Key facts at a glance

LOINC
14032-7
Short code
Ciprofloxacin Trough SerPl-mCnc
Synonyms
Ciprofloxacin Trough SerPl-mCnc
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 Is This Test Done?

Your healthcare provider may order this test if you’re taking ciprofloxacin (a fluoroquinolone antibiotic) for a serious infection, such as a urinary tract infection, respiratory infection, or other bacterial infections. It helps adjust your dose to avoid unnecessary side effects or resistance.

What Does the Result Mean?

The result shows the concentration of ciprofloxacin in your blood at a specific time. A therapeutic level indicates the antibiotic is working effectively, while levels that are too high or too low may need adjustments.

How Is the Sample Collected?

A blood sample is drawn from a vein, usually in your arm, by a healthcare professional. The blood is then sent to a lab for testing.

What Are Common Reasons for Testing?

Doctors may test for ciprofloxacin trough levels to confirm the antibiotic is at an effective concentration, especially if you have kidney issues, are taking other medications, or if the infection isn’t improving.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Antibiotic Level (Trough)

Frequently asked questions

What happens if my ciprofloxacin level is too low?
If your ciprofloxacin level is too low, your infection may not be fully treated. Your doctor might adjust your dosing schedule or prescribe a different antibiotic to help improve your response.
How often should I expect this test?
This test is typically done once during your treatment, depending on your condition and how your body responds to the medication. Your doctor will determine the timing and frequency based on your specific situation.
Can I eat or drink before the blood draw?
You can usually eat and drink normally before the blood draw, unless your doctor specifies otherwise. However, avoid caffeine or alcohol, as they may affect lab 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