Phenotypic abnormality Abnormality of blood and blood-forming tissues UMLS:C0018939 SNOMEDCT_US:34093004 UMLS:C4020864 Abnormality of the hematopoietic system HP:0003135 MSH:D006402 The hematopoietic system comprises the organs that are involved in the production of blood, primarily the bone marrow, spleen, tonsils, and lymph nodes. human_phenotype Abnormality of blood and blood-forming tissues HP:0001871 Abnormality of the haematopoietic system UMLS:C0850715 Hematological abnormality Hematologic disease An abnormality of the hematopoietic system. SNOMEDCT_US:191124002