Question: What is required to obtain a board certified subspecialty in hematopathology?
About the article "Pathology", section "Hematopathology".

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Hematopathology is the study of diseases of blood cells (White blood cells, red blood cells, platelets) and cells/tissues/organs comprising the hematopoietic system.
The term hematopoietic system refers to tissues and organs that produce and/or primarily host hematopoietic cells and include bone marrow, lymph node, thymus, spleen, and other lymphoid tissues.
In the United States, hematopathology is a board certified subspecialty (American Board of Pathology) practiced by those physicians who have completed general pathology residency (anatomic, clinical, or combined) and an additional year of fellowship training in hematology.
The hematopathologist reviews biopsies of lymph nodes, bone marrows and other tissues involved by an infiltrate of cells of the hematopoietic system.
In addition, the hematopathologist may be in charge of flow cytometric and/or molecular hematopathology studies.
After the hematopathologist makes the diagnosis, the hematologist or hemato-oncologist can make a decision about the best course of action.
Hematopathology is the branch of pathology which studies diseases of hematopoietic cells (see below).
In the United States, hematopathology is a board certified subspecialty (American Board of Pathology) practiced by those physicians who have completed general pathology residency (anatomic, clinical, or combined) and additional fellowship training in hematology.
Hematopoietic cells originate from the bone marrow and contribute the cellular components of blood including red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (megakaryocyte-derived bodies).
Additionally, leukocytes contribute significantly to the cellular composition of lymph nodes, the spleen, the thymus, and mucosa associated lymphoid tissues, and are present to some degree in all tissues.
Diseases of the hematopoietic system generally manifest as decreases (anemia) or increases (lymphoma/leukemia) in these cell types.
Consequently, hematopathologists most frequently evaluate peripheral blood smears, bone marrow aspirates and biopsies, and lymph nodes biopsies to determine the nature of hematopoietic disease.
The hematopathologist incorporates traditional microscopy with ancillary techniques including general laboratory values, immunohistochemistry, flow cytometry, and molecular diagnostic tests to make the most accurate diagnosis.
The hematopathologist works closely with the hematologist/oncologist specialty doctor who sees the patient and decides on the best treatment based upon the diagnosis made by the hematopathologist.  
Many pathologists seek fellowship-level training, or otherwise pursue expertise in a focused area of surgical pathology.
Subspecialization is particularly prevalent in the academic setting, where pathologists may specialise in an area of diagnostic surgical pathology that is relevant to their research, but is becoming increasingly prevalent in private practice as well.
Subspecialization has a number of benefits, such as allowing for increased experience and skill at interpreting challenging cases, as well as development of a closer working relationship between the pathologist and clinicians within a subspecialty area.
Commonly recognized subspecialties of surgical pathology include the following: Bone pathology Cardiac pathology Cytopathology (A board-certifiable subspecialty in the U.S.) Dermatopathology (A board-certifiable subspecialty in the U.S.) Endocrine pathology Gastrointestinal pathology Genitourinary pathology Gynecologic pathology Head and Neck Pathology Hematopathology (A board-certifiable subspecialty in the U.S.) Neuropathology (A board-certifiable subspecialty in the U.S. and a recognised specialty in the U.K.) Ophthalmic pathology Pediatric pathology (A board-certifiable subspecialty in the U.S. and a recognised specialty in the U.K.) Pulmonary pathology Renal pathology Soft tissue pathology  
Dermatopathology is a subspecialty of anatomic pathology that focuses on the skin as an organ.
It is unique in that there are two routes which a physician can use to obtain this specialization.
All general pathologists and general dermatologists are trained in the pathology of the skin; however, the dermatopathologist is a specialist in this organ.
In the USA, either a general pathologist or a dermatologist can undergo a 1 to 2 year fellowship in the field of dermatopathology.
The completion of this fellowship allows one to take a subspecialty board examination, and becomes a board certified dermatopathologist. 
In the United States, subspecialty-trained doctors of dentistry, rather than medical doctors, can be certified by a professional board to practice Oral and Maxillofacial Pathology.