{"id":"hepatitis-a-igm","name":"Hepatitis A antibody, IgM","shortName":"Hep A IgM","aliases":["Hepatitis A IgM","HAV IgM","Hepatitis A Virus Ab, IgM","Hep A IgM","Hep A IgM Ab","Hepatitis A Virus IgM Antibody, Serum","Hepatitis A Virus Antibody, IgM","Hepatitis A IgM Antibody","Hepatitis A Virus IgM Ab","HAV IgM Ab","HAV Ab IgM","IgM anti-HAV","Anti-HAV IgM","HAV-IgM","Hepatitis A Virus IgM"],"abbreviations":["HAV IgM","anti-HAV IgM","IgM anti-HAV"],"loinc":[{"code":"13950-1","primary":true},{"code":"22314-9","primary":false},{"code":"22315-6","primary":false},{"code":"5181-3","primary":false}],"specimen":"serum","units":[],"referenceRanges":[],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"An early antibody to the hepatitis A virus. A positive result can mean a current or recent hepatitis A infection.","url":"https://bloodtesttracker.com/markers/hepatitis-a-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."}