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Therefore, it is important to increase our knowledge of what symptoms and biomarkers could identify undiagnosed cases of celiac disease.\n<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>We screened for celiac disease antibodies in stored blood samples from 16,776 participants in eight population-based studies examined during 1976\u20132012. Undiagnosed celiac seropositivity was defined as celiac disease antibody positivity (IgG-deamidated gliadin peptide above 10.0 U\/mL and\/or IgA-tissue transglutaminase (TTG) or IgG-TTG above 7.0\u00a0U\/mL) without a known diagnosis of celiac disease in the National Patient Register. In all studies general health symptoms were recorded by participant-completed questionnaire, including self-perceived health, tiredness, headache and gastrointestinal symptoms. Furthermore, blood samples were drawn for analyses of biomarkers e.g. hemoglobin, blood glucose, cholesterol, liver parameters and vitamins. The participants with undiagnosed celiac seropositivity were matched by sex, age and study with four controls among the celiac disease antibody negative participants.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>We excluded, five participants with known celiac disease, resulting in a population of 16,771 participants. In this population 1% (169\/16,771) had undiagnosed celiac seropositivity. There were no statistically significant differences in symptoms between cases and controls. Undiagnosed celiac seropositivity was associated with low blood cholesterol (&lt;\u20095\u00a0mmol\/L) and low hemoglobin (&lt;\u20097.3\u00a0mmol\/L for women and &lt;\u20098.3\u00a0mmol\/L for men).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>In this general population study, undiagnosed cases of celiac seropositivity did not have more symptoms than controls, confirming the diagnostic difficulties of celiac disease and the low prognostic value of symptoms for a diagnosis of celiac disease. Furthermore, decreased levels of cholesterol and\/or hemoglobin in the blood were associated with undiagnosed celiac seropositivity.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12876-021-01667-y","type":"journal-article","created":{"date-parts":[[2021,2,27]],"date-time":"2021-02-27T11:02:53Z","timestamp":1614423773000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Symptoms and biomarkers associated with undiagnosed celiac seropositivity"],"prefix":"10.1186","volume":"21","author":[{"given":"Line Lund","family":"K\u00e5rhus","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Janne","family":"Petersen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Katja Biering","family":"Leth-M\u00f8ller","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Line Tang","family":"M\u00f8llehave","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anja Lykke","family":"Madsen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Betina Heinsb\u00e6k","family":"Thuesen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peter","family":"Schwarz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J\u00fcri J.","family":"Rumessen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Allan","family":"Linneberg","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,2,27]]},"reference":[{"key":"1667_CR1","doi-asserted-by":"publisher","first-page":"70","DOI":"10.1016\/S0140-6736(17)31796-8","volume":"391","author":"B Lebwohl","year":"2018","unstructured":"Lebwohl B, Sanders DS, Green PHR. 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The screening for CD in Health2006 5-year follow-up was approved on September 6, 2011 (H-3-2011-081) and measurements of CD antibodies in stored blood samples were approved on January 12, 2016 (H-15014502). The study was performed in accordance with the Declaration of Helsinki.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"90"}}