age gestational age http://id.loc.gov/authorities/subjects/sh85054725 http://purl.bioontology.org/ontology/MESH/D005865 http://purl.org/sig/ont/fma/fma293325 https://en.wikipedia.org/wiki/Gestational_age https://www.wikidata.org/wiki/Q2253111 RG613.5 GA The age of the conceptus, beginning from the time of fertilization. In clinical obstetrics, the gestational age is often estimated as the time from the last day of the last menstruation which is about 2 weeks before ovulation and fertilization. estimated gestational age unknown gestational age