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Preeclampsia can affect the activity of many organs. It is very important because if this disorder is associated with changes in thyroid function, it can affect the results of maternal and fetal tests. Accordingly, the aim of this meta-analysis study was to assess the abnormalities in thyroid function tests in preeclampsia.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Studies were selected through a systematic search of the MEDLINE\/PubMed, Scopus, Web of Science Core Collection, and Google Scholar databases in 31st August 2021. Also, reference lists of review articles and relevant studies were manual-searched to identify other potentially eligible studies. English studies that compared TSH, T4 and T3 of normal pregnant with preeclamptic women (Known to be normotensive before pregnancy; gestational age 20\u00a0week or more; singleton pregnancy; no previous history of thyroid dysfunction) were screened. Data sets were screened for eligibility by two independent reviewers. Articles were assessed by the Newcastle\u2013Ottawa Scale. The Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach was used for quality assessment of evidence on outcome levels.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>After reviewing 886 published studies, 63 observational studies were selected and used for this meta-analysis. The study population included 21,528 pregnant women. The findings revealed that TSH (SMD\u2009=\u20091.70, 95%CI: 1.39 to 2.02;<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001) was significantly higher in preeclamptic women. TT4 (SMD\u2009=\u2009-0.82, 95%CI: -1.16, -0.49; p\u2009&lt;\u20090.001), TT3 (SMD\u2009=\u2009-0.88, 95%CI: -1.36 to -0.41;<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.001) and FT3 (SMD\u2009=\u2009-0.59, 95%CI: -0.91 to -0.27; p\u2009&lt;\u20090.001) were less in preeclamptic women. There\u00a0was no statistically significant difference\u00a0in FT4 between\u00a0two groups (SMD\u2009=\u20090.002, 95%CI: -0.27 to 0.27;<jats:italic>p<\/jats:italic>\u2009=\u2009.990). The results of publication bias and sensitivity analysis confirmed the reliability and stability of this meta-analysis.\u00a0The quality of evidence was regarded as moderate, low, and very low for these risk factors according to the GRADE approach.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Findings of this meta-analysis indicated preeclamptic women were more at risk of changes in thyroid function tests. In order to prevent thyroid disorders, it is recommended that thyroid function tests be performed in women with pre-eclampsia.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12902-022-01154-9","type":"journal-article","created":{"date-parts":[[2022,9,26]],"date-time":"2022-09-26T06:02:32Z","timestamp":1664172152000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Association of thyroid function test abnormalities with preeclampsia: a systematic review and meta-analysis"],"prefix":"10.1186","volume":"22","author":[{"given":"Mahboubeh","family":"Hajifoghaha","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Saeed Hosseini","family":"Teshnizi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sedighe","family":"Forouhari","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohammad Hossein","family":"Dabbaghmanesh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,9,26]]},"reference":[{"issue":"03","key":"1154_CR1","doi-asserted-by":"publisher","first-page":"131","DOI":"10.47419\/bjbabs.v2i03.42","volume":"2","author":"A Sadek","year":"2021","unstructured":"Sadek A, et al. 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