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UKCRC Health Research Classification System


Main inclusion criteria

Haematological diseases, anaemia, clotting (including thromboses and venous embolisms) and normal development and function of platelets and erythrocytes


Advice on health categories

Not all haemopoietic cells or ‘blood cells’ are erythrocytes (red blood cells). This term is often used to encompass lymphocytes, macrophages, granulocytes and other white cell types. Check the context of the research.

e.g. if the research relates to leukaemia it will be referring to lymphocytes etc. and not to erythrocytes and therefore should be coded as Cancer and not be coded as Blood.

Studies investigating blood flow to the brain should be coded as Stroke.

Blood clots (thromboses) can lead to wider cardiovascular complications and stroke. In these circumstances code to the primary condition of focus ignoring pathogenesis, but following rules for sequelae where appropriate.


Official terminology

Full name of category

Short name Unique ID
Blood Blood



Related external links

International Classification of Diseases (ICD 10 v2016) – Chapter III:   Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)