The International Council for Standardization in Haematology (ICSH) was originally founded as a standardizing committee associated with the European Society of Haematology in 1963. The ICSH has been associated with the International Society for Laboratory Hematology (ISLH) since 2007.

The ICSH is a not-for-profit organisation that aims to achieve reliable and reproducible results in laboratory analysis in the field of diagnostic haematology.

The ICSH coordinates Working Groups of experts to examine laboratory methods and instruments for haematological analyses, to deliberate on issues of standardization and to stimulate and coordinate scientific work as necessary towards the development of international standardization materials and guidelines.