Hematology is the medical specialty that studies blood, the blood-forming organs and the clotting system. This page summarizes what hematology covers, common problems and symptoms, typical diagnostic tests, and guidance on when to seek specialist or emergency assessment.
Hematology focuses on red blood cells, white blood cells, platelets and the bone marrow. Conditions seen by hematologists include various forms of anemia, bleeding and clotting disorders, leukemias and other blood cancers, myeloproliferative and myelodysplastic syndromes. Hematologists diagnose, monitor and coordinate care with other specialists when needed.
Problems can show as fatigue or pallor (often associated with anemia), easy bruising or bleeding from gums and nose (platelet or clotting abnormalities), and symptoms linked to white cell disorders such as frequent infections, unexplained weight loss or night sweats. Any persistent or unexplained change should prompt discussion with a primary care clinician or hematology specialist.
Initial evaluation usually includes a detailed history and physical exam plus basic lab tests such as a complete blood count (CBC) and peripheral blood smear. Additional tests may include coagulation studies (PT, aPTT), reticulocyte count, bone marrow biopsy when indicated, and molecular or genetic testing for specific conditions. Test selection depends on clinical findings.
Seek immediate medical attention for heavy or sudden bleeding, difficulty breathing, chest pain, loss of consciousness, or very high fever with severe weakness. Fever in someone with very low blood counts or a suppressed immune system can signal a serious infection and requires rapid evaluation. In such situations contact emergency services or go to the nearest emergency department.
Many blood disorders require ongoing laboratory monitoring and specialist follow-up. Discuss planned surgeries or dental procedures with your hematologist if you have a bleeding history. Hematology often coordinates with oncology, genetics, transplant centers, radiology and intensive care to provide a comprehensive care plan and safe peri-procedural management.
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