Haemolytic anaemia, i.e. haemoglobin < 10 g/dL and haemolysis, i.e. free bilirubin > 1.5 ULN and haptoglobin < 0.1 g/dL, Anaemia due to lack of regeneration, i.e. haemoglobin < 10 g/dL and reticulocytes < 80,000/mm3.