- Electrocardiogram (ECG) shows signs such as prolongation of the PR interval, increased QRS duration, and development of ventricular arrhythmias.
- Serum digoxin level: A blood test to measure the amount of digoxin in the blood. Toxic levels are generally considered to be above 2 ng/mL.
- Magnesium levels: Low levels of magnesium can make digoxin toxicity worse.
- Potassium levels: Low levels of potassium can also worsen digoxin toxicity.
- Blood urea nitrogen (BUN): Elevated BUN can indicate decreased renal function and decreased digoxin clearance, increasing the risk of toxicity.