Fanconi's anemia is a –
Constitutional pancytopenia

Constitutional pancytopenia is defined as decreased marrow production of the 3 major hematopoietic lineages on an inherited basis, resulting in anemia, neutropenia and thrombocytopenia.
Important causes are : -
Fanconi anemia                             o Amegakaryocytic thrombocytopenia
Shwachman-Diamond syndrome      o Down syndrome
Dyskeratosis congenita                   o Noonan syndrome
Constitutional anemia
Hemolytic anemia
Iron deficiency anemia
Auto - immune anemia