title: Platelet volume, density and 5 HT organelles (mepacrine test) in acute leukaemia.
abstract: Qualitative platelet parameters (volume, 5 hydroxy-tryptamine (5 HT) organelles studied by the mepacrine test, and density) were evaluated in 31 patients with acute leukaemia: 11 myelomonocytic (AML), 8 lymphoblastic (ALL), 12 granulocytic (AGL). Macrothrombocytosis was observed in most of the cases of AML, was rare in AGL and was never found in ALL. The 5 HT organelles/volume ratio was normal in AGL and ALL but was significantly decreased in AML. In contrast, platelet density distribution was always abnormal whatever the platelet volume and 5 HT organelle concentration. Thus, using simple new methods, convenient even in cases of thrombocytopenia, we demonstrate that qualitative platelet abnormalities are a constant feature in acue leukaemia and that they are more severe in AML.
mesh_terms: D001772:Blood Cell Count; D001792:Blood Platelets / Q000378:metabolism; D003594:Cytoplasmic Granules / Q000378:metabolism; D006801:Humans; D007938:Leukemia / Q000097:blood*; D007945:Leukemia, Lymphoid / Q000097:blood; D007948:Leukemia, Monocytic, Acute / Q000097:blood; D015470:Leukemia, Myeloid, Acute / Q000097:blood; D011796:Quinacrine; D012701:Serotonin / Q000097:blood*; D013922:Thrombocytosis / Q000097:blood
chemical_list: D012701:Serotonin; D011796:Quinacrine