In calculating the percentage of myeloblasts in the bone marrow, the following data are given. Erythroid nuclear precursors (E) = 65%, myeloblasts = 14%, other cells = 21%. Based on these numbers, what is the percentage of myeloblasts by the FAB classification?

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According to the FAB classification, myeloblasts should make up 30-49% of cells in the bone marrow. Since the percentage of myeloblasts in this scenario is 14%, it is below the minimum percentage for the FAB classification. However, if we subtract the percentage of erythroid nuclear precursors (65%) from the percentage of other cells (21%), we get 40%, which falls within the range for the FAB classification of myeloblasts. Therefore, the answer is C) 40%.

In Calculating the Percentage of Myeloblasts in the Bone Marrow