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Red blood cell acetylcholinesterase activity and lysis in various dyshaemopoietic disorders.

144 patients with various dyshaemopoietic disorders were tested for red blood cell acetylcholinesterase (RBC-AChE) activity and for in vitro lysis in the acidified-serum test and sucrose haemolysis test. The RBC-AChE activity was significantly reduced in acute leukaemia, chronic myeloid leukaemia and myelofibrosis. In all other cases the enzyme activity was normal, except in patients with chronic lymphatic leukaemia complicated with autoimmune haemolytic anaemia. The acidified-serum test was negative in all cases. The sucrose haemolysis test was positive in a significant number of patients, particularly in those with acute leukaemia, chronic myeloid leukaemia and myelofibrosis. 
 
 
 
The acute leukaemia and myelofibrosis cases with severe anaemia had lower RBC-AChE activity than those without or with mild anaemia; also cases with positive sucrose lysis test had lower AChE activity than those with negative test.