Platelet monoamine oxidase activity has been measured in 17 patients with megaloblastic anaemia due to either vitamin B12 or folate deficiency, and in 20 healthy subjects. There was a highly significant increase in patients compared with controls. In two patients, platelet activity decreased following successful treatment. A significant correlation between platelet activity and the severity of bone marrow megaloblastic change, assessed by the deoxyuridine suppression test and bone marrow morphology, was also observed. If the change in activity also occurs in the nervous system, this may contribute to the mental disturbance associated with vitamin B12 or folate deficiency.
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