Haematological genetic testing is routinely indicated to elucidate the underlying molecular aetiology of hereditary disorders affecting erythrocytes, haemostasis, and bone marrow function. It serves as a decisive diagnostic tool when standard methods like complete blood counts, blood film morphology, and functional coagulation assays yield inconclusive results. A molecular diagnosis may support disease classification, guide clinical management, facilitate genetic counselling, and enable testing of at-risk family members. The clinical spectrum of hereditary, non-malignant hematologic disorders can be broadly divided into five main diagnostic categories:
- Haemoglobin disorders: This category encompasses structural haemoglobin variants (e.g., ) and synthesis defects ( and ). Molecular genetic testing identifies causative variants, enables carrier screening, and elucidates complex combinations of variants that cannot be distinguished using first-line electrophoretic or chromatographic tests.
- Inherited red cell anemias: Includes erythrocyte membrane defects (e.g., ), enzymopathies, and haeme synthesis disorders (e.g., ). Next-generation sequencing (NGS) gene panels represent the gold-standard approach for diagnosing these heterogeneous phenotypes.
- Inherited bleeding & platelet disorders: Covers coagulation factor deficiencies ( and , rare factor deficiencies), , and inherited functional or structural platelet defects.
- Heritable thrombophilias: Comprises genetic defects that predispose to hypercoagulability and venous thromboembolism (e.g., , , and natural anticoagulant deficiencies), representing the functional opposite of bleeding disorders.
- Inherited : Involves germline mutations leading to primary haematopoietic stem cell collapse and multi-lineage cytopenias (e.g., Fanconi anaemia, Diamond-Blackfan anaemia, and dyskeratosis congenita).
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