A positive result for antiphospholipid IgM antibodies indicates the presence of IgM class antibodies targeting phospholipids in the blood. Antiphospholipid IgM antibodies are one of the types associated with antiphospholipid syndrome (APS). The detection of IgM antibodies suggests an immune system response and may indicate an increased risk of abnormal blood clot formation. It is important to note that a positive IgM result alone does not confirm a diagnosis of APS. Consult with your doctor once you receive the results; they will help you understand the meaning of the result and may prescribe a few additional tests.