Table 2.

Classification of neutropenia

Congenital	Severe infantile agranulocytosis (Kostmann’s syndrome), Shwachman–Diamond–Oski syndrome, Myelokathexis/neutropenia with tetraploid nuclei, Cyclic neutropenia,Chediak–Higashi syndrome, Reticular dysgenesis, Dyskeratosis congenita
Acquired	Postinfectious neutropenia
	Drug-induced neutropenia
	Complement activation (haemodialysis, leukapheresis,ARDS)
	Immune neutropenia
	Isoimmune neonatal neutropenia, Alloimmune neutropenia(transfusion reaction), Autoimmune neutropenia(primary), Autoimmune neutropenia(secondary)
	Chronic idiopathic neutropenia
	Hypersplenism
	Nutritional deficiency (vitamin B12 or folate deficiency)
	Diseases affecting the bone marrow
	Postchemotherapy, Aplastic anaemia, Fanconi anaemia, Myelodysplastic syndrome, Acute and chronic leukaemia

Adapted from Capsoni et al. [5]