Percentage of Blasts in AML

Ans.(c) 20%Ref: Nelson 18th ed. ch. 495* The characteristic feature of AML is that >20% of bone marrow cells on bone marrow aspiration or biopsy touch preparations constitute a fairly homogeneous population of blast cells, with features similar to those that characterize early differentiation states of the myeloid-monocyte-megakaryocyte series of blood cells. The most common classification of the subtypes of AML is the FAB system.French-American-British (FAB) Classification of Acute Myelogenous LeukemiaSUBTYPECOMMON NAMEMlAcute myeloblastic leukemia without maturationM2Acute myeloblastic leukemia with maturationM3Acute promyeloblastic leukemiaM4Acute myelomonocytic leukemiaM5Acute monocytic leukemiaM6ErythroleukemiaM7Acute megakaryocytic leukemia