{"id":"gentamicin-trough","name":"Gentamicin (Trough)","shortName":"Gentamicin Trough","aliases":["Gentamicin Level, Trough","Gentamicin (Trough)","Gentamicin Trough","Gentamicin, Trough","Gentamicin Trough Level","Gentamicin, Trough Level","Gentamicin Trough, Serum","Gentamicin Level Trough"],"abbreviations":[],"loinc":[{"code":"3665-7","primary":true},{"code":"22747-0","primary":false},{"code":"31092-0","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"ug/mL","display":"mcg/mL"},{"ucum":"mg/L","display":"mg/L"},{"ucum":"umol/L","display":"µmol/L"}],"referenceRanges":[{"population":"Adults","low":null,"high":2,"unit":"ug/mL","unitDisplay":"mcg/mL","note":"Upper limit only. The FDA label says to adjust the dose so troughs above 2 mcg/mL are avoided, and a 2024 hospital protocol used under 2 mg/L (under 1.5 for urinary tract infections). Very low or undetectable troughs are common and expected, especially with once-daily dosing. Your care team sets your target.","sources":[{"title":"Gentamicin Sulfate Injection, USP: prescribing information","url":"https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=977180b3-a222-4282-d485-4a3217674305","publisher":"Hospira, via DailyMed (NIH National Library of Medicine)","year":2026},{"title":"Appropriateness of gentamicin therapeutic drug monitoring at a Middle Eastern tertiary hospital setting: a retrospective evaluation and quality audit","url":"https://doi.org/10.1080/20523211.2024.2375753","publisher":"Journal of Pharmaceutical Policy and Practice","year":2024},{"title":"Drug Critical Limits for Urgent Physician Notification","url":"https://doi.org/10.1002/cpt.70277","publisher":"Clinical Pharmacology & Therapeutics","year":2026}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Shows how much gentamicin is still in your blood just before your next dose, a check that the antibiotic is clearing and not building up.","url":"https://bloodtesttracker.com/markers/gentamicin-trough","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}