Hematology is the medical specialty that focuses on the study, diagnosis, treatment, and prevention of diseases affecting the blood, bone marrow, and lymphatic system, including disorders of red blood cells, white blood cells, platelets, hemoglobin, and coagulation.

What conditions are treated by a hematologist?

A hematologist manages conditions such as anemia, iron deficiency, leukemias, lymphomas, myeloma, bleeding and clotting disorders, inherited blood diseases, and persistent abnormalities detected on blood tests or blood smears.

What is the difference between hematology and oncology?

Hematology covers benign and malignant blood disorders, while oncology primarily focuses on solid tumors; the two overlap in the management of blood cancers such as leukemia and lymphoma.

What is a peripheral blood smear and why is it important?

A peripheral blood smear is a microscopic examination of blood cells that helps assess red cell morphology, white cell differentials, and platelet numbers, and it supports diagnosis in many hematological disorders.

What blood tests are commonly used in hematology?

Common tests include the complete blood count (CBC), blood film examination, coagulation studies, iron studies, vitamin B12 and folate levels, and specialist investigations such as bone marrow examination when indicated.

What is the role of the bone marrow in hematology?

Bone marrow is the primary site of blood cell production, where hematopoietic stem cells mature into red blood cells, white blood cells, and platelets, making it central to normal hematopoiesis and many blood disorders.

When should a patient be referred to a hematologist?

Referral is appropriate for unexplained anemia, persistent abnormal blood counts, recurrent bleeding or thrombosis, suspected blood cancers, or ongoing abnormalities on blood tests or peripheral blood smears.

What is the difference between hematology and hematopathology?

Hematology is the clinical specialty providing patient care for blood disorders, while hematopathology focuses on laboratory diagnosis using blood films, bone marrow biopsies, and specialized testing.

Why is hematology important in general medicine?

Hematology is important because blood abnormalities may reflect systemic disease, infection, inflammation, malignancy, nutritional deficiency, or organ dysfunction, and blood tests are fundamental to medical diagnosis.

Is hematology a medical or laboratory specialty?

Hematology is both clinical and laboratory-based, combining patient management with interpretation of blood tests, blood smears, and bone marrow findings.

What does the term haematology mean?

Haematology is the British spelling of hematology and refers to the same specialty concerned with blood, blood-forming organs, and blood disorders.

How does hematology help in diagnosing disease early?

Hematology supports early diagnosis through routine blood tests and microscopic examination, which can identify conditions such as anemia, infection, leukemia, and coagulation abnormalities before symptoms become advanced.

Ask Hematologist | Understand Hematology

Tumor Immunology

October 31, 2018 4 comments

Tumor immunology is the study of how the immune system interacts with cancer cells, focusing on the mechanisms by which tumors develop, evade immune detection, and resist destruction. Understanding the tumor microenvironment, immune checkpoints, and tumor-associated antigens is essential in both hematology and oncology, as these insights drive the development of advanced immunotherapies such as checkpoint inhibitors, CAR-T cell therapy, […]

Category: Immune System

Bone Marrow Examination

September 30, 2018 One comment

Bone marrow examination refers to the pathologic analysis of samples of bone marrow obtained by bone marrow aspiration and bone marrow biopsy (often called a trephine biopsy). Bone marrow is soft, gelatinous tissue that fills the medullary cavities, the centers of bones. The two types of bone marrow are red bone marrow, known as myeloid tissue, and yellow bone marrow, or fatty tissue. Bone marrow contains […]

Category: Procedures

Hematologic Emergencies

August 30, 2018 Leave a comment

Hematologic emergencies represent life-threatening conditions arising from disorders of the blood, bone marrow, or lymphatic system that require immediate recognition and management to prevent serious morbidity and mortality. These emergencies may result from underlying malignancies, treatment complications, or acute derangements in hematologic function such as tumour lysis syndrome, disseminated intravascular coagulation (DIC), neutropenic sepsis, hyperleukocytosis, and severe thrombocytopenia. Early diagnosis […]

Category: Hematologic Emergencies

CD Markers

July 30, 2018 27 comments

Diagram showing the overlap of immunohistochemistry markers (CD10, Bcl-6, MUM1, Bcl-2) used for classifying and subtyping lymphomas, particularly B-cell lymphomas.

CD is an abbreviation for “cluster of differentiation”. CD molecules are cell surface markers which are very useful for the identification and characterization of leukocytes and the different subpopulations of leukocytes. The HLDA (Human Leukocyte Differentiation Antigens) workshop, which started in 1982, developed the CD nomenclature and has maintained the list of CD Markers ever since. The initial idea behind […]

Category: CD Markers

New Hematology Drugs

June 29, 2018 Leave a comment

Adcetris brentuximab vedotin injection vial for treatment of CD30 positive Hodgkin lymphoma

New hematology drugs have transformed the treatment landscape of blood cancers and other hematologic disorders over the past two decades. Advances in the molecular understanding of hematologic malignancies have identified multiple therapeutic targets, leading to the rapid development and approval of new hematology drugs, including targeted therapies, immunotherapies, and cellular treatments. These new hematology drugs have significantly improved patient outcomes, […]

Category: Drugs

Plasmapheresis

May 31, 2018 25 comments

What is Plasmapheresis? Plasmapheresis, also known as therapeutic plasma exchange (TPE), is a medical procedure that involves removing a patient’s plasma and replacing it with a substitute such as saline, albumin, or donor plasma. The process separates plasma from blood cells using a centrifuge or membrane filtration system, allowing the selective removal of pathogenic antibodies, immune complexes, and toxins. Plasmapheresis […]

Category: Immune System

Blood Morphology

April 30, 2018 38 comments

Megakaryocyte in bone marrow aspirate showing large multilobulated nucleus and granular cytoplasm

Blood morphology adds greatly to the value of a routine blood count. A skilful examination of a well-made blood smear constitutes the most valuable single procedure in the hematology laboratory. Despite normal blood count figures, careful observation of blood morphology suggested previously unsuspected disorders. For example, in some cases, the finding of hypersegmented neutrophils on the blood smear was the […]

Category: Blood Morphology

PET imaging in Hematology

March 30, 2018 8 comments

Positron emission tomography (PET) imaging in hematology is a key diagnostic modality that provides detailed three-dimensional (3D) functional imaging of metabolic activity within the body. It has become a cornerstone in the evaluation of hematological malignancies, particularly for staging, treatment response assessment, and detection of disease recurrence. PET is a nuclear medicine imaging technique that uses small amounts of radioactive […]

Category: Radiology

Tumor Lysis Syndrome

February 28, 2018 5 comments

Tumor Lysis Syndrome (TLS) is a severe, potentially life-threatening oncologic emergency that arises during or shortly after the treatment of cancer. This critical condition is defined by the rapid breakdown of cancer cells, causing the massive release of intracellular contents (such as potassium, phosphate, and uric acid) into the bloodstream. While TLS is most commonly associated with hematologic malignancies like […]

Category: Cancer Therapy

Paraneoplastic Syndromes

January 30, 2018 Leave a comment

Paraneoplastic syndromes are symptoms that occur at sites distant from a tumor or its metastasis. They are rare disorders that are triggered by an altered immune system response to a neoplasm. Recent medical advances have improved the understanding, diagnosis, and treatment of paraneoplastic syndromes. These disorders arise from tumor secretion of hormones, peptides, or cytokines or immune cross-reactivity between malignant and […]

Category: Paraneoplastic Syndromes

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