The French–American–British (FAB) classification systems refers to a series of classifications of hematologic diseases. It is based on the presence of dysmyelopoiesis and the quantification of myeloblasts and erythroblasts. It was first produced in 1976. Types include: FAB classification of acute lymphoblastic leukemias: L1–L3 (three subtypes) FAB classification of acute myeloid leukemias: M0–M7 (eight subtypes) FAB classification of myelodysplastic syndromes Updates continued through at least 1989. References Hematologic neoplasms