AAB Medical Technologist Hematology Practice Exam – Complete Study Guide 2026

The presence of giant, bizarre platelets, nucleated red blood cells (nRBCs), and teardrop red blood cells (RBCs) is strongly associated with myelofibrosis. In this condition, the bone marrow undergoes significant fibrosis, leading to ineffective hematopoiesis and resultant abnormalities in blood cell production.

Giant, bizarre platelets occur due to megakaryocyte fragmentation and dysplasia in the marrow, which are characteristic features of myelofibrosis. The increased production of nRBCs indicates a compensatory response to anemia and is a result of extramedullary hematopoiesis, which happens when the bone marrow is no longer able to produce sufficient blood cells. Furthermore, teardrop RBCs form as they navigate through a fibrotic bone marrow environment, resulting in their distinctive shape.

In contrast, while conditions like polycythemia vera and essential thrombocythemia involve abnormalities of platelet production and blood cell proliferation, they do not typically exhibit the full spectrum of findings such as teardrop RBCs and nRBCs to the same degree as myelofibrosis. Chronic myelogenous leukemia can have altered blood cell morphology as well, but the specific combination