The Digoxin (Lanoxin) level test is a blood test used to measure the amount of the medication digoxin in your bloodstream and ensure it is within a safe and effective range.

Digoxin (brand name Lanoxin) is a cardiac glycoside used to treat certain heart conditions such as atrial fibrillation, atrial flutter, and heart failure. Because digoxin has a narrow therapeutic window (the difference between a helpful dose and a toxic dose is small), monitoring blood levels is important.