{"id":"digoxin","name":"Digoxin","shortName":"Digoxin","aliases":["Digoxin Level","Lanoxin","Digoxin, Serum","Lanoxicaps","Digitek","Digoxin Serum Level","Digoxin, Total","Digoxin Drug Level"],"abbreviations":[],"loinc":[{"code":"10535-3","primary":true},{"code":"14698-5","primary":false},{"code":"83093-5","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"ng/mL","display":"ng/mL"},{"ucum":"nmol/L","display":"nmol/L"}],"referenceRanges":[{"population":"Adults","low":0.5,"high":2,"unit":"ng/mL","unitDisplay":"ng/mL","note":"Adult therapeutic window as described in the FDA label: diminished efficacy below 0.5 ng/mL and more toxicity without added benefit above 2 ng/mL. Labs disagree. A 2023 review that phoned ten national labs found that 4 of 10 had lowered the upper limit to 0.9 to 1.2 ng/mL, while the rest still printed about 0.8 to 2.0 or 2.4 ng/mL (0.8 to 2.0 has been the traditional range since the 1970s), and heart-failure guidance suggests aiming for 0.5 to 0.9. Use your lab's range. Babies and children are interpreted differently.","sources":[{"title":"Digoxin prescribing information (Dosage and Administration 2.2, Drug Interactions 7.4, Overdosage, Clinical Pharmacology)","url":"https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=1b7e5c6e-e052-41b0-a4ce-05dfe62faaaf","publisher":"U.S. FDA label via NLM DailyMed (Hikma Pharmaceuticals)","year":2025},{"title":"Review: Failure of current digoxin monitoring for toxicity: new monitoring recommendations to maintain therapeutic levels for efficacy","url":"https://pubmed.ncbi.nlm.nih.gov/37465455/","publisher":"Frontiers in Cardiovascular Medicine","year":2023}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures digoxin (Lanoxin), a heart medicine, in your blood to check that the dose is in a helpful and safe range.","url":"https://bloodtesttracker.com/markers/digoxin","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}