{"id":"beta-2-glycoprotein-1-igm","name":"Beta-2 Glycoprotein I Antibody IgM","shortName":"Anti-β2GPI IgM","aliases":["B2GP1 IgM","Beta-2 Glycoprotein 1 IgM","Beta 2 GPI IgM","Anti-β2GPI IgM","B2 Glycoprotein I Ab IgM","Beta-2 Glycoprotein I IgM","Anti-beta2GP1 IgM","Beta-2 Glycoprotein 1 Antibody IgM","Beta-2 Glycoprotein 1 Antibodies, IgM, Serum","Beta 2 GP1 Ab IgM, S","β2-Glycoprotein 1 Antibodies, IgM","Beta-2 Glycoprotein I Ab, IgM","Beta-2-Glycoprotein I Antibody (IgM)","Anti-beta-2 glycoprotein I IgM","aβ2GPI IgM","B2GPI IgM","Anti-β2 Glycoprotein I Antibody IgM"],"abbreviations":["aβ2GPI IgM","B2GPI IgM","B2GP1 IgM"],"loinc":[{"code":"44449-7","primary":true},{"code":"16136-4","primary":false},{"code":"43916-6","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"[arb'U]/mL","display":"U/mL"}],"referenceRanges":[{"population":"Adults","low":0,"high":15,"unit":"[arb'U]/mL","unitDisplay":"U/mL","note":"Mayo Clinic Laboratories (ELISA, reported in SMU): negative below 15.0 (15.0 itself is weakly positive), applies to all ages. Labs differ: Labcorp reports 0.0-8.5 EliA U/mL and ARUP reports 20 or less SMU. Cutoffs are specific to each assay, so use the range printed on your own report.","sources":[{"title":"Beta-2 Glycoprotein 1 Antibodies, IgM, Serum (test MB2GP)","url":"https://www.mayocliniclabs.com/test-catalog/overview/86181/beta-2-glycoprotein-1-antibodies-igm-serum","publisher":"Mayo Clinic Laboratories"}]},{"population":"Adults","low":0,"high":8.5,"unit":"[arb'U]/mL","unitDisplay":"U/mL","note":"Labcorp (Thermo Fisher EliA fluorescence enzyme immunoassay): 0.0-8.5 EliA U/mL. Cutoffs are specific to each assay, so use the range printed on your own report.","sources":[{"title":"β2-Glycoprotein 1 Antibodies, IgM (test 163908)","url":"https://www.labcorp.com/tests/163908/b2-glycoprotein-1-antibodies-igm","publisher":"Labcorp"}]},{"population":"Adults","low":0,"high":20,"unit":"[arb'U]/mL","unitDisplay":"U/mL","note":"ARUP Laboratories (semi-quantitative ELISA, reported in SMU): 20 or less SMU. Cutoffs are specific to each assay, so use the range printed on your own report.","sources":[{"title":"Beta-2 Glycoprotein 1 Antibodies, IgG and IgM (test 0050321)","url":"https://ltd.aruplab.com/Tests/Pub/0050321","publisher":"ARUP Laboratories"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures IgM antibodies against beta-2 glycoprotein I, a blood protein. It is one of the tests used when a clinician is looking into antiphospholipid syndrome (APS).","url":"https://bloodtesttracker.com/markers/beta-2-glycoprotein-1-igm","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}