{"id":"levetiracetam","name":"Levetiracetam","shortName":"Levetiracetam","aliases":["Keppra","Levetiracetam Level","Levetiracetam, Serum","LEV","Levetiracetam, Serum or Plasma","Levetiracetam Serum Level","Levetiracetam Blood Level","Keppra Level","Levetiracetam (Keppra)"],"abbreviations":["LEV"],"loinc":[{"code":"30471-7","primary":true},{"code":"48347-9","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":10,"high":40,"unit":"ug/mL","unitDisplay":"mcg/mL","note":"ARUP's test directory lists a therapeutic range of 10 to 40 mcg/mL. Other sources differ: a 2016 review suggests 12 to 46 mg/L (the same units) for a daily dose of 1 to 3 g, matching the ILAE figure, and a 2018 review notes Norwegian labs use 5 to 41 mg/L and that in two sets of routine samples about 45% of results were under 12 mg/L. It is used to check adherence, overdose and dose changes, not as a target to hit: levetiracetam has a wide safety margin and the link between level and effect is weak. Your lab may print a different range. The 2017 AGNP consensus uses 50 mcg/mL as a laboratory alert level, as cited in a 2026 survey.","sources":[{"title":"Keppra (Levetiracetam) (ARUP test 0098627)","url":"https://ltd.aruplab.com/Tests/Pub/0098627","publisher":"ARUP Laboratories"},{"title":"An Updated Overview on Therapeutic Drug Monitoring of Recent Antiepileptic Drugs","url":"https://doi.org/10.1007/s40268-016-0148-6","publisher":"Drugs in R&D","year":2016},{"title":"Reference ranges for antiepileptic drugs revisited: a practical approach to establish national guidelines","url":"https://doi.org/10.2147/dddt.s154388","publisher":"Drug Design, Development and Therapy","year":2018},{"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":"Measures the level of levetiracetam, an anti-seizure medicine, in your blood to check it is being absorbed and cleared as expected.","url":"https://bloodtesttracker.com/markers/levetiracetam","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}