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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

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Accession:HP:0005548 term browser browse the term
Definition:A reduced count of megakaryocytes.
Comment:Megakaryocytes are giant cells in the bone marrow. Mature blood platelets are released from the cytoplasm of megakaryocytes.
Synonyms:xref: UMLS:C1858312

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of blood and blood-forming tissues 0
        Abnormality of bone marrow cell morphology 0
          Abnormal megakaryocyte morphology 0
            Megakaryocytopenia 0
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