Osteopenia is a term to define bone density that is not normal but also not as low as osteoporosis. By definition from the World Health Organization osteopenia is defined by bone densitometry as a T score -1 to -2.5. The phenotype is Osteopenia (Human Phenotype Ontology term HP_0000938). Also known as: Generalised osteopenia, Generalized osteopenia, Osteopaenia.