Medical Laboratory Scientist (MLS) ASCP Practice Exam

Question: 1 / 400

Which form of leukemia is referred to as Acute Myelomonocytic Leukemia?

FAB M1

FAB M4

Acute Myelomonocytic Leukemia is correctly identified as FAB M4. This classification is part of the French-American-British (FAB) classification system for leukemias, which categorizes acute myeloid leukemias (AML) based on the morphology and the immunophenotype of the malignant cells. FAB M4 specifically represents a subtype that is characterized by both myeloid and monocytic features, which is integral to its nomenclature.

The presence of a significant number of monoblasts in this subtype distinguishes it from other categories in the FAB classification. It often exhibits both myeloblasts and monoblasts, leading to various clinical manifestations. This distinction is crucial for diagnosis and treatment planning, as it impacts the overall prognosis and management of the disease. Understanding the classification helps laboratory scientists not only in diagnostics but also in guiding therapeutic approaches based on the type of leukemia identified.

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FAB M5

FAB M2

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