{"id":"anticardiolipin-igm","name":"Anticardiolipin Antibody IgM","shortName":"aCL IgM","aliases":["Anticardiolipin IgM","Cardiolipin IgM","aCL IgM","Cardiolipin Antibody IgM","ACA IgM","Cardiolipin Antibody, IgM","Anticardiolipin Antibodies IgM","Anti-cardiolipin IgM","ACL IgM","Cardiolipin IgM Ab","Cardiolipin Ab IgM","Anticardiolipin Ab IgM","IgM Anticardiolipin Antibody","Cardiolipin Antibodies, IgM","Anti-Cardiolipin Antibody, IgM"],"abbreviations":["aCL IgM","IgM aCL"],"loinc":[{"code":"3182-3","primary":true},{"code":"8067-1","primary":false}],"specimen":"serum","units":[{"ucum":"[MPL'U]/mL","display":"MPL U/mL"}],"referenceRanges":[{"population":"Adults","low":0,"high":12,"unit":"[MPL'U]/mL","unitDisplay":"MPL U/mL","note":"ARUP Laboratories: 12 MPL or less is negative, 13 to 19 is indeterminate, 20 to 80 is low to moderately positive and 81 or more is high positive. Cutoffs differ by lab and test kit (one published lab validated 20 units as its 99th-percentile ELISA cutoff), so use the range printed on your report. Chemiluminescent assays report U/mL or CU on a different scale and are not covered by this range.","sources":[{"title":"Cardiolipin Antibody, IgM (test 0050902)","url":"https://ltd.aruplab.com/Tests/Pub/0050902","publisher":"ARUP Laboratories"},{"title":"Diagnosis of Antiphospholipid Syndrome by Chemiluminescent or Enzyme-Linked Immunosorbent Assay - A Comparison Study and Comprehensive Literature Review","url":"https://pubmed.ncbi.nlm.nih.gov/40079798/","publisher":"Clinical and Applied Thrombosis/Hemostasis","year":2025}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Measures IgM antibodies to cardiolipin, a fat in cell membranes. Levels above your lab's cutoff are one piece of testing for antiphospholipid antibodies.","url":"https://bloodtesttracker.com/markers/anticardiolipin-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."}