Levofloxacin Concentration in Plasma (24-Hour Urine Collection)

Why This Test Is Done

Your healthcare provider may order this test if you’re taking levofloxacin to treat or prevent certain infections, such as bacterial pneumonia, skin infections, or urinary tract infections. It helps ensure the medication is reaching the right concentration in your body to fight the infection effectively without causing unnecessary side effects.

What to Expect Before the Test

You’ll need to collect all your urine for a full 24 hours and send it to the lab. Typically, you’ll start the collection right after waking up and continue until you wake up the next morning. Drink plenty of water to help flush out the drug naturally. Follow any specific instructions your provider gives you to avoid interfering substances.

What Happens During the Test

No special preparation is needed beyond the urine collection. The lab will analyze the collected urine sample to measure levofloxacin levels. Results are usually reported as a concentration value, which helps guide your treatment plan.

What the Results Mean

Results help determine if your levofloxacin dose is appropriate. Low levels may indicate the drug isn’t working well, while very high levels could suggest side effects or improper dosing. Your provider will discuss these results with you and adjust your treatment if needed.