Fluoroquinolone (e.g., ciprofloxacin, levofloxacin) concentration in serum/plasma

Why This Test Is Done

Doctors may request this test if you’re taking a fluoroquinolone antibiotic (like ciprofloxacin or levofloxacin) to treat infections such as urinary tract infections, respiratory infections, or certain types of bacterial infections. It helps confirm whether the drug is reaching effective levels in your bloodstream.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. If you’re on this antibiotic, your levels may be checked at different times (e.g., before or after doses) to monitor effectiveness.

What the Results Mean

Results show how much antibiotic is in your blood at the time of testing. Low levels may mean the drug isn’t working well, while very high levels could indicate side effects. Your doctor will interpret these results in relation to your specific condition and treatment plan.

Possible Causes of Abnormal Results

Low levels might suggest the antibiotic isn’t being absorbed well or isn’t the right dose for your infection. High levels could be due to kidney issues affecting clearance or rare allergic reactions. Always discuss results with your healthcare provider.