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Hematologist: Role, Conditions Treated & When to See One

What Is a Hematologist?

A hematologist is a physician specializing in the diagnosis, treatment, and prevention of diseases of the blood, bone marrow, lymph nodes, spleen, and coagulation system. Training: Internal medicine residency (3 years) + hematology/oncology fellowship (3 years) — often combined as "hem/onc."

Conditions Managed

Benign Hematology

  • Anemias: iron deficiency, B12/folate deficiency, hemolytic (AIHA, hereditary spherocytosis, G6PD), aplastic, anemia of chronic disease
  • Thrombocytopenia: ITP, TTP, HIT, drug-induced, gestational
  • Thrombocytosis: reactive, essential thrombocythemia
  • Coagulopathies: hemophilia A/B, von Willebrand disease, factor deficiencies, DIC
  • Thrombophilia: Factor V Leiden, prothrombin mutation, antiphospholipid syndrome
  • Hemoglobinopathies: sickle cell disease, thalassemias
  • Neutropenia: cyclic, autoimmune, drug-induced, congenital

Malignant Hematology

  • Leukemias: AML, ALL, CML, CLL
  • Lymphomas: Hodgkin, non-Hodgkin (DLBCL, follicular, mantle cell, etc.)
  • Multiple myeloma & plasma cell disorders (MGUS, smoldering myeloma, amyloidosis)
  • Myeloproliferative neoplasms: PV, ET, PMF
  • Myelodysplastic syndromes (MDS)

Key Responsibilities

  1. Diagnosis: History, physical, CBC with differential, peripheral smear review, flow cytometry, bone marrow aspiration/biopsy, cytogenetics (karyotype, FISH), molecular testing (NGS panels), coagulation assays, imaging.
  2. Treatment Planning: Risk stratification (IPSS-R for MDS, IPI for lymphoma, etc.), guideline-concordant therapy (chemo, immunotherapy, targeted agents, BCR-ABL TKIs, BTK inhibitors, CAR-T, bispecifics, stem cell transplant).
  3. Procedures: Bone marrow biopsy, lumbar puncture (intrathecal chemo), central line placement, therapeutic phlebotomy.
  4. Supportive Care: Transfusion support (RBC, platelets), growth factors (G-CSF, EPO), infection prophylaxis, iron chelation, pain management.
  5. Longitudinal Monitoring: Response assessment (morphologic, cytogenetic, molecular/MRD), late effects surveillance.
  6. Multidisciplinary Coordination: With radiation oncology, transplant, pathology, genetics, palliative care, primary care.
  7. Research & Education: Clinical trials, teaching, guideline development.

When to Refer to a Hematologist

  • Unexplained cytopenias (anemia, thrombocytopenia, neutropenia)
  • Abnormal blood film (blasts, atypical lymphocytes, teardrop cells, schistocytes)
  • Thrombosis at unusual sites, recurrent, young age, unprovoked
  • Suspected hematologic malignancy (lymphadenopathy, splenomegaly, monoclonal protein)
  • Bleeding disorder workup
  • Pregnancy with known hematologic condition
  • Preoperative evaluation for bleeding/thrombosis risk

Settings

Academic medical centers, community hospitals, private practice, specialized hemophilia/thrombosis centers, transplant units.

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