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To specify the indication for interruption of therapy, we analysed the German registry \u201cHypoDok\u201d for infants with CH, which oversees 1625 patients from 49 participating centres in Germany and Austria from 1997 until today. A total of 357 patients with a thyroid gland in loco typico were identified and retrospectively grouped according to cessation (TCH,\n n<\/jats:italic>\n = 24) or continuation (PCH,\n n<\/jats:italic>\n = 333) of\n l<\/jats:sc>\n -thyroxine (\n l<\/jats:sc>\n -T\n 4<\/jats:sub>\n ) treatment at 2 years of age. The receiver operating characteristic (ROC) analysis was performed to identify cutoffs predicting TCH by screening TSH concentrations and\n l<\/jats:sc>\n -T\n 4<\/jats:sub>\n dosages. Gestational ages, birth weights and prevalence of associated malformations were comparable in both groups. The cutoff screening TSH concentration was 73 mU\/L. The cutoff daily\n l<\/jats:sc>\n -T\n 4<\/jats:sub>\n dosage at 1 year was 3.1 \u03bcg\/kg (90% sensitivity, 63% specificity; 36 \u03bcg\/day) and at 2 years of age 2.95 \u03bcg\/kg (91% sensitivity, 59% specificity; 40 \u03bcg\/day). At 2 years of age, specificity (71%) increased when both of these parameters were considered together.\n <\/jats:p>\n \n Conclusion<\/jats:italic>\n : The decision to continue or cease\n l<\/jats:sc>\n -T\n 4<\/jats:sub>\n treatment at 2 years of age in CH patients diagnosed in neonatal screening may be based on their screening TSH concentrations and individual\n l<\/jats:sc>\n -T\n 4<\/jats:sub>\n dosages at 1 and 2 years of age. Thus, TCH and PCH may be distinguished; overtreatment avoided; and affected families reassured.\n \n \n \n \n \n What is Known:<\/jats:bold>\n \u2022\n The course of congenital primary hypothyroidism may be transient, causing potential overtreatment.<\/jats:italic>\n \u2022\n The dose of<\/jats:italic>\n \n l<\/jats:sc>\n <\/jats:italic>\n -thyroxine at 1 or 2 years of age may predict a transient course of primary congenital hypothyroidism.<\/jats:italic>\n <\/jats:td>\n <\/jats:tr>\n \n \n What is New:<\/jats:bold>\n \u2022\n TSH screening concentration and<\/jats:italic>\n \n l<\/jats:sc>\n <\/jats:italic>\n -thyroxine dosages at 1 and 2 years of age represent reliable predictors for transient congenital primary hypothyroidism with higher sensitivity and specificity when considered together in order to select eligible patients who qualify for treatment withdrawal.<\/jats:italic>\n <\/jats:td>\n <\/jats:tr>\n <\/jats:tbody>\n <\/jats:table>\n <\/jats:table-wrap>\n <\/jats:p>","DOI":"10.1007\/s00431-021-04031-0","type":"journal-article","created":{"date-parts":[[2021,3,25]],"date-time":"2021-03-25T19:40:09Z","timestamp":1616701209000},"page":"2401-2408","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Predictors of transient congenital primary hypothyroidism: data from the German registry for congenital hypothyroidism (AQUAPE \u201cHypoDok\u201d)"],"prefix":"10.1007","volume":"180","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3833-4658","authenticated-orcid":false,"given":"Nicola","family":"Matejek","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sascha R.","family":"Tittel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Holger","family":"Haberland","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tilman","family":"Rohrer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eva-Maria","family":"Busemann","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Norbert","family":"Jorch","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karl-Otfried","family":"Schwab","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joachim","family":"W\u00f6lfle","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Reinhard W.","family":"Holl","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Markus","family":"Bettendorf","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,3,25]]},"reference":[{"key":"4031_CR1","unstructured":"Krude H (2010) Diagnose, Therapie und Verlaufskontrolle der Prim\u00e4ren, angeborenen Hypothyreose. https:\/\/www.awmf.org\/leitlinien\/detail\/ll\/027-017.html"},{"key":"4031_CR2","doi-asserted-by":"crossref","unstructured":"Messina MF, Aversa T, Salzano G, Zirilli G, Sferlazzas C, De Luca F, Lombardo F (2015) Early discrimination between transient and permanent congenital hypothyroidism in children with eutopic gland. 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The local caregivers obtained parental written consent. All data was collected during routine care.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval"}},{"value":"Written consent has been obtained from the parents\/caregiver of each patient after full explanation of the purpose and nature of all procedures used.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}},{"value":"Not applicable.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}}]}}