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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

Term:Extremely preterm birth
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Accession:HP:0025665 term browser browse the term
Definition:Birth before 28 completed weeks of gestation (up to and including 27 weeks and 6 days of gestation).

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Term paths to the root
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Term Annotations click to browse term
  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of prenatal development or birth 0
        Premature birth 0
          Extremely preterm birth 0
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