{"id":"anti-sm","name":"Anti-Smith (Sm) Antibody","shortName":"Anti-Sm","aliases":["Smith Antibody","Anti-Sm","Sm Antibody","Anti-Smith","Sm Ab (IgG)","Smith Ab","Anti-Smith Antibody","Anti-Smith (Sm) Antibody","Smith (ENA) Antibody, IgG","Smith Antibody, IgG","Sm (Smith) Antibody","Sm Antibody IgG","ENA Sm Ab","ENA SM Ab, Serum","Anti-Sm Antibody","Smith Antibodies","Anti-Smith Ab"],"abbreviations":["Anti-Sm","Sm Ab"],"loinc":[{"code":"33564-6","primary":true},{"code":"11090-8","primary":false},{"code":"18323-6","primary":false},{"code":"43182-5","primary":false}],"specimen":"serum","units":[{"ucum":"[arb'U]/mL","display":"AU/mL"}],"referenceRanges":[{"population":"Adults","low":0,"high":40,"unit":"[arb'U]/mL","unitDisplay":"AU/mL","note":"ARUP Laboratories multiplex bead assay, reported in AU/mL (arbitrary units), with a reference interval of 40 or less. ARUP reads 29 or less as negative, 30 to 40 as equivocal and 41 or more as positive. Units and cutoffs are specific to each kit and are not interchangeable (other labs report antibody index or chemiluminescent units with different cutoffs), so use the cutoff and flag printed on your own report.","sources":[{"title":"Smith (ENA) Antibody, IgG (test 0050085)","url":"https://ltd.aruplab.com/Tests/Pub/0050085","publisher":"ARUP Laboratories"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Looks for antibodies to the Smith (Sm) protein. A positive result is uncommon and is most closely linked with lupus.","url":"https://bloodtesttracker.com/markers/anti-sm","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}