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The increasing prevalence of ART and FET emphasises the need to assess potential health risks associated with the procedures, both in pregnancy, such as pre-eclampsia and large for gestational age offspring, and in the children, such as obesity and cardiometabolic dysfunction.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Methods and analysis<\/jats:title>\n                  <jats:p>The cohort will include 600 pregnant women, their potential partner and their offspring in a 1:1:1 ratio of pregnancies achieved after ART with FET, ART with fresh-ET and women who conceived naturally. The study will involve extensive data collection from electronic medical records; parental questionnaires; biochemical, genetic and epigenetic analyses in blood, urine and placental tissue; and medical imaging (fetal ultrasound and PEA POD scan) and clinical examinations. Outcomes are grouped into six work packages (WPs) related to fetal growth (WP1), pregnancy (WP2), placenta (WP3), offspring (WP4), genetics (WP5) and epigenetics (WP6).<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Ethics and dissemination<\/jats:title>\n                  <jats:p>The COMPART study aims to provide valuable insights into the impact of ART and FET on maternal and offspring health and the underlying mechanisms responsible. The study seeks to advance reproductive medicine, shape clinical practice and guidelines and ultimately ensure maternal-fetal health following ART. The study has been approved by the Danish Ethics Committee (H-23071266; February 2024).<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Trial registration number<\/jats:title>\n                  <jats:p>\n                     <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"clintrialgov\" xlink:href=\"NCT06334003\">NCT06334003<\/jats:ext-link>\n                  <\/jats:p>\n               <\/jats:sec>","DOI":"10.1136\/bmjopen-2025-105754","type":"journal-article","created":{"date-parts":[[2025,9,17]],"date-time":"2025-09-17T03:00:15Z","timestamp":1758078015000},"page":"e105754","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Cardiometabolic function in Offspring, Mother and Placenta after Assisted Reproductive Technology (COMPART): a prospective cohort study"],"prefix":"10.1136","volume":"15","clinical-trial-number":[{"clinical-trial-number":"nct06334003","registry":"10.18810\/clinical-trials-gov"},{"clinical-trial-number":"nct06334003","registry":"10.18810\/clinical-trials-gov"}],"author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3623-7635","authenticated-orcid":false,"given":"Anna Sophie Lebech","family":"Kjaer","sequence":"first","affiliation":[{"name":"The Fertility Clinic, Department of Gynaecology, Fertility and Obstetrics, Copenhagen University Hospital - 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