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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:Preimplantation lethality
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Accession:HP:0032479 term browser browse the term
Definition:It is estimated that about 40-70 percent of human embryos produced in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI) are viable embryos, whereas others arrest at different early stages of development. The phenotype of preimplantation lethality is inferred if IVF and ICSI cycles fail because all of an individual's embryos are arrested at early stages of development.
Synonyms:exact_synonym: Preimplantation embryonic lethality

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of prenatal development or birth 0
        Preimplantation lethality 0
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