title: Hemoglobin/hematocrit and other erythrocyte parameters.
abstract: The authors review erythrocyte physiology, blood collection, and laboratory methodology for enumerating blood cells. The clinical interpretation of abnormal erythrocyte parameters is discussed, and the emergency department approach to anemia and polycythemia is detailed.
mesh_terms: D000740:Anemia / Q000175:diagnosis; D001800:Blood Specimen Collection / Q000379:methods; D003937:Diagnosis, Differential; D004630:Emergencies; D004905:Erythrocyte Aging; D004909:Erythrocyte Indices; D004912:Erythrocytes / Q000502:physiology; D004920:Erythropoiesis; D006400:Hematocrit; D006454:Hemoglobins / Q000032:analysis* / Q000378:metabolism; D006470:Hemorrhage / Q000175:diagnosis; D006801:Humans; D010100:Oxygen / Q000097:blood; D011086:Polycythemia / Q000175:diagnosis; D012016:Reference Values
chemical_list: D006454:Hemoglobins; D010100:Oxygen