The Direct Coombs Test (DCT) is the definitive test for diagnosing autoimmune hemolytic anemia. It answers one key question: 'Are there antibodies directly attached to your red blood cells, causing your body to destroy them?' This test is crucial for investigating unexplained anemia or jaundice, and it's the standard for detecting a transfusion reaction or hemolytic disease in newborns. This simple blood test provides a clear, identifying the root autoimmune cause of your condition.