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| Anaemia of chronic disease |
| Blood loss |
| Gastrointestinal loss, menorrhagias |
| Nutritional deficiencies |
| Iron, folate, B12 |
| Immune mediated |
| Haemolysis, red cell aplasia, haemophagocytosis, aplastic anaemia, pernicious anaemia |
| Myelofibrosis |
| Uraemia |
| Treatment induced |
| Microangiopathic haemolysis |
| Disseminated intravascular coagulation, thrombotic thrombocytopenic purpura, drugs |
| Hypersplenism |
| Infection |
| Myelodysplasia |
