Classical hematology is a foundational subfield within the discipline of hematology dedicated to the study and diagnosis of non-malignant disorders affecting blood and its components. This area encompasses the investigation of conditions such as anemias, hemoglobinopathies, bleeding and clotting disorders, and non-malignant white blood cell and platelet disorders, traditionally relying upon morphological assessment and laboratory-based analyses; its significance lies in representing the historical core and methodological basis of the broader hematology field.