Digoxin (Serum) analysis is a test performed to measure the level of the medication digoxin in the blood, which is primarily used to treat certain heart disorders such as atrial fibrillation and heart failure. This analysis is essential to ensure the correct dosage, as drug levels can greatly affect both its effectiveness and safety. By monitoring digoxin levels, doctors can avoid the risks of drug toxicity, as elevated levels can lead to serious symptoms such as nausea, dizziness, and vision disturbances. This test is recommended periodically, especially for patients receiving long-term treatment or those with additional health conditions.