Designed to allow easy reference to key haematological facts, this book allows rapid assessment of laboratory results and an indication of the appropriate tests for both diagnosis and the assessment of a patient. The aetiology of certain conditions - pancytopenia, purpura in children, macrocytic anaemia - have been considered. Because of the rate of development in haematology, many new tests which are not, as yet, performed in routine laboratories, are described here. Details are also given of rare diseases which have interesting relationships with haemophilia - for example, von Willebrand's disease, which is connected with four syndromes.