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Maximum cardiac output and stroke volume values were measured in gestational weeks 30\u201332 and decreased over the third trimester, whereas systemic vascular resistance increased during the same period. We created reference ranges for eight combinations of maternal height, age and parity. We also created a simple calculator to allow for implementation of the reference ranges in clinical practice.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Our reference ranges allow the use of a bedside ultrasound device to non\u2010invasively assess cardiac function in pregnancy and identify women at risk of complications. The unconditional ranges allow clinicians to evaluate isolated measurements and identify women needing follow\u2010up. The conditional ranges incorporate information from previous measurements and improve monitoring over time.<\/jats:p><\/jats:sec>","DOI":"10.1111\/1471-0528.17667","type":"journal-article","created":{"date-parts":[[2023,9,22]],"date-time":"2023-09-22T02:06:11Z","timestamp":1695348371000},"page":"463-471","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Reference ranges for third\u2010trimester maternal cardiovascular function parameters measured in normotensive pregnant women using a non\u2010invasive cardiac output monitor: A study based on data from the prospective <scp>PEACH<\/scp> cohort study"],"prefix":"10.1111","volume":"131","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0289-8905","authenticated-orcid":false,"given":"Frederikke","family":"Lihme","sequence":"first","affiliation":[{"name":"Department of Epidemiology Research Statens Serum Institut  Copenhagen 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