Triamterene and Indomethacin Plasma Concentration (Quantitative)

Why This Test Is Done

Your doctor may order this test if you’re taking triamterene (often used to treat high blood pressure or kidney conditions) and/or indomethacin (used for pain, inflammation, or certain heart conditions). It helps monitor whether your medications are working properly or if adjustments are needed to avoid side effects.

What to Expect Before the Test

No special preparation is usually required, but you may be asked to fast for a few hours before the blood draw if your doctor specifies it. Bring a list of all medications you’re taking, including over-the-counter drugs and supplements, to share with your healthcare provider.

What Happens During the Test

A healthcare professional will draw blood from a vein in your arm. The blood sample will be sent to a lab for analysis. The test measures the concentration of these medications in your plasma, which is the liquid part of blood.

What the Results Mean

Results are typically reported as concentrations (measured in micrograms per milliliter or another unit). Low levels may indicate your medication isn’t working well, while high levels could signal side effects or toxicity. Your doctor will interpret these results in the context of your medical history and symptoms.