<unk>  will often involve >1 cell line; other conditions restricted to single line
Aplastic anemia
Iron deficiency anemia
Viral infection (EBV, CMV, Parvo), HIV
Immune thrombocytopenia
Rheumatologic diseases
Leukemia 
Leukemias will often involve >1 cell line; other conditions restricted to single line
Leukopenia
Aplastic anemia
Acute myeloid leukemia
Iron deficiency anemia
Myelofibrosis
Viral infection 