CD40LG and autoimmune hemolytic anemia: The anemia was determined to be an autoimmune hemolytic anemia (AIHA; LDH 3170 U/L (87–225 U/L), total bilirubin 1.9 mg/dL (0–1.2 g/dL), indirect bilirubin 1.6 mg/dL (0.2–0.7 mg/dL), reticulocyte count 5.2% (0.5–2.1%)) in the setting of positive IgM cold agglutinin antibodies and positive direct Coombs test.