FIELD: medicine. SUBSTANCE: the suggested method deals with preparing chromosomal preparations to analyze karyotype of bone marrow cells at diseases of blood system. The method includes both colchinization and hypotonization of bone marrow cells followed by 7-min-long prefixation in 6%- acetic acid solution at room temperature with subsequent fixation and application of cellular suspension onto a slide. The innovation enables to increase mitotic index in the preparation obtained, thus, favoring to increase accuracy in analyzing karyotype of bone marrow cells in hemoblastoses-suffering patients. EFFECT: higher efficiency. 1 ex
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