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Fluoroquinolone (e.g., ciprofloxacin) Serum Concentration by Immunoassay

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

This test measures the amount of a specific antibiotic (fluoroquinolone) in your serum. It helps doctors monitor how your body is responding to treatment.

Quick summary

["Antibiotic levels help ensure you’re getting the right dose and avoid overuse or side effects."]

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

Key facts at a glance

LOINC
57327-9
Short code
FLUAV IgM sp2 Ser IA-aCnc
Synonyms
FLUAV IgM sp2 Ser IA-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
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 fluoroquinolone antibiotics (like ciprofloxacin) to treat infections such as urinary tract infections, gastrointestinal infections, or certain types of pneumonia. It’s also used in patients with kidney or liver issues to adjust dosing safely.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample drawn from a vein in your arm. The test uses a small needle, and you may feel a brief pinch. The sample is then sent to a lab for analysis.

What the Test Results Mean

Results show the concentration of fluoroquinolone in your blood. Low levels may mean the drug isn’t working well, while very high levels could indicate side effects or improper dosing. Your doctor will interpret these results in the context of your treatment plan.

Possible Side Effects

Fluoroquinolones can cause side effects like nausea, stomach pain, or rare but serious issues such as tendon damage or nerve problems. If you experience severe pain, swelling, or neurological symptoms, contact your doctor immediately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Fluoroquinolone Level

Frequently asked questions

How long does it take to get the results of this test?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Your doctor will discuss the findings with you during your follow-up visit.
Can I stop taking my fluoroquinolone antibiotic before the test?
No, do not stop taking your fluoroquinolone unless your doctor instructs you to. Skipping doses or stopping early can affect the accuracy of the test results and your treatment effectiveness.
What if I have kidney or liver problems?
If you have kidney or liver issues, your doctor may adjust your fluoroquinolone dose based on the test results to prevent buildup of the drug in your body, which could lead to side effects.
  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