Aplastic anemia (AA) is a rare, potentially life-threatening, nonmalignant disease. The disease is characterized by pancytopenia and persistent, unexplained marrow aplasia with full replacement of marrow hematopoiesis by fat cells. To identify patients with AA, a comprehensive diagnostic approach is crucial. A rigorous, stepwise diagnostic process should be followed to confirm, characterize, and classify the disease and its severity. This typically involves medical history, physical examination, blood tests, bone marrow investigations, cytogenetic tests, molecular analysis, and immunophenotyping. Diagnosis of AA can sometimes be challenging due to its overlapping characteristics with other rare conditions. AA lacks specific markers and therefore the differential diagnosis is part of the diagnostic process, for which much experience is required. Differentiating AA from other bone marrow failure syndromes like Myelodysplastic Syndrome, Paroxysmal Nocturnal Hemoglobinuria, or inherited bone marrow failures is crucial because each condition requires specific management strategies.