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Based on these results the authors concluded that gestational age\u2010independent umbilical cord lactate cut\u2010off could give false\u2010negative or false\u2010positive diagnosis of lacticemia. To our knowledge, these findings have not been incorporated into clinical interpretations in delivery units. To perform an external validity study for the findings by Wiberg et al, we analyzed umbilical cord blood lactate levels according to gestational age in a post\u2010date delivery study population at our large, tertiary obstetric unit. The parallel finding of our study to that of Wiberg et al highlights the importance of using available gestational age dependent reference ranges (eg as presented in Wiberg\u2019s publication), when interpreting umbilical cord blood lactate levels for fetal wellbeing.<\/jats:p>","DOI":"10.1111\/aogs.13922","type":"journal-article","created":{"date-parts":[[2020,5,22]],"date-time":"2020-05-22T12:25:42Z","timestamp":1590150342000},"page":"1430-1433","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Gestational age reference ranges for umbilical cord blood lactate: An external validation study of post\u2010date pregnancies"],"prefix":"10.1111","volume":"99","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5402-4468","authenticated-orcid":false,"given":"Sophie","family":"Bowe","sequence":"first","affiliation":[{"name":"Division of Obstetrics and Gynecology Oslo University Hospital Oslo Norway"},{"name":"Faculty of 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