The categories below are stepped in that anaemia patients at one level are those remaining after patients belonging to all earlierlevels have been excluded. For example, level 2 patients with thalassaemia are selected from the whole group of anaemia patients after excluding the level 1 patients with radiotherapy.
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↵AAplastic anaemia, Acute myeloid leukaemia, Acute lymphoblastic leukaemia, Myelodysplasia, Myeloproliferative disease (myelofibrosis), Chronic leukaemia any type, Myeloma, Non-haematological malignant infiltration (Q6B1 thru Q6B9)
↵BCardiac, respiratory or vascular disease (Q13) or on any of the drugs (Q13b)
In patients with acute blood loss, a threshold of 100 g/L has been set
Reproduced with permission from the National Comparative Audit of Blood Transfusion.2