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Serum ferritin levels serve as a biomarker of iron storage; however, their distribution and determinants in sick newborn infants remain unclear. This study aimed to investigate the reference range and independent variables of serum ferritin in hospitalized newborn infants. All newborn infants who were hospitalized at a tertiary neonatal center within 24\u00a0h of birth were retrospectively reviewed for the period of April 2015 through March 2017. Serum ferritin levels were assessed using venous blood samples obtained at admission and their independent variables were explored. The study population comprised 368 infants (36.2\u2009\u00b1\u20092.8\u00a0weeks gestation and 2319\u2009\u00b1\u2009623\u00a0g at birth), whose median serum ferritin level was 149\u00a0\u00b5g\/L (inter-quartile range: 81\u2013236). The multivariable model used to explain serum ferritin values comprised hemoglobin, lactate dehydrogenase, blood pH, and maternal hypertensive disorders in pregnancy (all\n                    <jats:italic>p\u2009&lt;<\/jats:italic>\n                    \u20090.01, adjusted for sex and birth weight). Serum ferritin values in hospitalized newborn infants were comparable to those previously reported using umbilical cord blood. Our novel findings indicated the association between blood pH, lactate dehydrogenase, and ferritin levels, suggesting the influence of antenatal hypoxia\u2013ischemia and stress to serum ferritin levels.\n                  <\/jats:p>","DOI":"10.1038\/s41598-023-35404-0","type":"journal-article","created":{"date-parts":[[2023,5,24]],"date-time":"2023-05-24T10:02:44Z","timestamp":1684922564000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Control variables of serum ferritin concentrations in hospitalized newborn infants: an observational study"],"prefix":"10.1038","volume":"13","author":[{"given":"Tadashi","family":"Hisano","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Junichiro","family":"Okada","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kennosuke","family":"Tsuda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sachiko","family":"Iwata","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shinji","family":"Saitoh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Osuke","family":"Iwata","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,5,24]]},"reference":[{"key":"35404_CR1","doi-asserted-by":"publisher","first-page":"506","DOI":"10.1002\/9781119946045","volume-title":"Present Knowledge in Nutrition","author":"JWJ Erdman","year":"2012","unstructured":"Erdman, J. 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