Ceftazidime Concentration in Serum/Plasma (Quantitative)

Why This Test Is Done

Doctors order ceftazidime levels most often when you’re receiving intravenous (IV) ceftazidime therapy for serious bacterial infections, such as those affecting the blood, lungs, or other organs. It helps ensure the correct dose is maintained and that the infection is responding to treatment. This test may also be used in patients with kidney problems, where the drug’s clearance might be affected.

What to Expect Before the Test

No special preparation is needed for this test. A healthcare provider will draw blood from a vein in your arm. You may feel a slight pinch, but the process usually takes a few minutes. If you’re on IV ceftazidime, your blood sample may be taken from the same site or another vein.

What the Test Results Mean

Results are typically reported as a concentration (measured in micrograms per milliliter or milligrams per liter). While exact reference ranges vary by lab and patient factors, low levels may indicate insufficient drug exposure, while dangerously high levels could signal toxicity or improper dosing. Your doctor will interpret these results in the context of your treatment plan.

Common Reasons for Testing

Your doctor might request this test if you’re experiencing symptoms like fever, rash, or worsening infection despite treatment. It may also be used to adjust your dose if you have kidney issues or are taking other medications that interact with ceftazidime.