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Haematology – Understanding Blood Disorders

Haematology is the medical specialty focused on the study of blood, blood-forming organs, and their diseases, including conditions such as anaemia and leukaemia.

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Things worth knowing about "Haematology"

Haematology is the medical specialty focused on the study of blood, blood-forming organs, and their diseases, including conditions such as anaemia and leukaemia.

What is Haematology?

Haematology (also spelled hematology in American English) is a branch of internal medicine that deals with the science and clinical practice related to blood, blood-forming organs such as the bone marrow, spleen, and lymph nodes, as well as the diseases that affect these structures. Physicians who specialise in this field are called haematologists.

Blood performs vital functions in the human body: it transports oxygen and nutrients to all organs, removes metabolic waste products, helps regulate body temperature, and plays a central role in immune defence and blood clotting.

Scope and Focus Areas of Haematology

Haematology covers the diagnosis, treatment, and research of a wide range of conditions. The most important areas include:

Anaemia: Conditions characterised by a reduced number of red blood cells or lower haemoglobin levels, impairing oxygen transport.
Leukaemia: Malignant diseases of the blood and bone marrow in which abnormal white blood cells proliferate uncontrollably.
Lymphomas: Cancers of the lymphatic system, including Hodgkin lymphoma and non-Hodgkin lymphomas.
Myelomas: Malignant diseases of plasma cells in the bone marrow, such as multiple myeloma.
Coagulation disorders: Conditions affecting blood clotting, such as haemophilia or deep vein thrombosis.
Thrombocytopenias: A reduction in platelet count, leading to an increased tendency to bleed.

Components of Blood

Blood consists of several cellular and non-cellular components that are studied in haematology:

Erythrocytes (red blood cells): Transport oxygen throughout the body using haemoglobin.
Leukocytes (white blood cells): Part of the immune system and responsible for fighting infections.
Thrombocytes (platelets): Essential for blood clotting and wound healing.
Plasma: The liquid component of blood that carries proteins, hormones, and nutrients.

Diagnostic Methods in Haematology

Various diagnostic procedures are used to identify haematological diseases:

Full blood count (FBC): Measures the number and characteristics of blood cells and haemoglobin levels.
Differential blood count: Provides a detailed breakdown of the different types of white blood cells.
Bone marrow aspiration and biopsy: Removal of bone marrow tissue to assess blood cell production.
Coagulation tests: Measure clotting time and the activity of clotting factors.
Flow cytometry: Analysis of blood cells based on surface markers, commonly used to diagnose leukaemia.
Genetic testing: Identification of chromosomal or genetic abnormalities associated with blood disorders.

Treatment Approaches in Haematology

Treatment options in haematology are diverse and tailored to the specific condition:

Drug therapy: Includes cytostatic agents (chemotherapy), targeted therapies (e.g., tyrosine kinase inhibitors), and corticosteroids.
Immunotherapy: Harnesses the immune system to fight blood cancers, for example through monoclonal antibodies or CAR T-cell therapy.
Stem cell transplantation: Transfer of healthy stem cells to restore blood cell production after intensive chemotherapy.
Transfusions: Administration of blood or blood products in cases of severe blood loss or anaemia.
Anticoagulants: Medications that inhibit blood clotting, used in the treatment of thrombosis or embolism.

Haematology and Oncology

In clinical practice, haematology is closely intertwined with oncology (the study and treatment of cancer). Many haematological diseases are malignant, which is why the combined specialty of haematology and oncology is typically housed within a single department at most hospitals. The close collaboration between both disciplines enables comprehensive care for patients with blood cancers and related conditions.

References

Hoffbrand, A.V. and Moss, P.A.H. - Hoffbrand's Essential Haematology. Wiley-Blackwell, 7th edition, 2016.
World Health Organization (WHO) - Classification of Tumours of Haematopoietic and Lymphoid Tissues. IARC Press, Lyon. Current edition.
Kaushansky, K. et al. - Williams Hematology. McGraw-Hill Education, 9th edition, 2016.

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