{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T21:33:43Z","timestamp":1778103223062,"version":"3.51.4"},"reference-count":21,"publisher":"BMJ","issue":"3","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2022,2,25]]},"published-print":{"date-parts":[[2022,3]]},"abstract":"<jats:p>Hypocalcaemia in neonates can range from asymptomatic to a potentially life-threatening condition. We present a case of a 36\u2009weeks gestational age boy, admitted to our neonatal intensive care unit for jitteriness, mild hypotonia and breastfeeding difficulties. By the ninth day of life, he presented with late-onset hypocalcaemia, hypomagnesaemia, low 25-OH-vitamin D and inappropriately normal parathyroid hormone. Further investigation revealed maternal hypercalcaemia with high parathyroid hormone. Maternal asymptomatic hyperparathyroidism was diagnosed and admitted as the cause of neonatal hypocalcaemia. There was a clinical improvement and calcium levels stabilisation after treatment with calcium gluconate and vitamin D<jats:sub>3<\/jats:sub>. This case highlights the importance of careful evaluation of neonatal late-onset hypocalcaemia in uncovering asymptomatic maternal hyperparathyroidism.<\/jats:p>","DOI":"10.1136\/bcr-2021-248262","type":"journal-article","created":{"date-parts":[[2022,3,16]],"date-time":"2022-03-16T12:11:46Z","timestamp":1647432706000},"page":"e248262","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":4,"title":["Transient neonatal hypocalcaemia caused by maternal hyperparathyroidism"],"prefix":"10.1136","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1770-1842","authenticated-orcid":false,"given":"Joana S","family":"Gon\u00e7alves","sequence":"first","affiliation":[{"name":"Pediatrics Department, Centro Hospitalar de Lisboa Ocidental EPE, Lisboa, Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luisa Carrington","family":"Queir\u00f3","sequence":"additional","affiliation":[{"name":"Pediatrics Department, Centro Hospitalar de Lisboa Ocidental EPE, Lisboa, Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joana","family":"Soares","sequence":"additional","affiliation":[{"name":"Pediatrics Department, Centro Hospitalar de Lisboa Ocidental EPE, Lisboa, Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"C\u00e1tia R","family":"Correia","sequence":"additional","affiliation":[{"name":"Pediatrics Department, Centro Hospitalar de Lisboa Ocidental EPE, Lisboa, Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2022,3,16]]},"reference":[{"key":"2025082706511051000_15.3.e248262.1","doi-asserted-by":"publisher","DOI":"10.1007\/s12098-010-0176-0"},{"key":"2025082706511051000_15.3.e248262.2","doi-asserted-by":"publisher","DOI":"10.1016\/S0929-6646(08)60194-1"},{"key":"2025082706511051000_15.3.e248262.3","doi-asserted-by":"crossref","first-page":"42","DOI":"10.24911\/SJP.106-1516889879","article-title":"Three cases of transient neonatal pseudohypoparathyroidism","volume":"18","author":"Kutilek","year":"2018","journal-title":"Sudan J Paediatr"},{"key":"2025082706511051000_15.3.e248262.4","unstructured":"Mitsiakos G N , Katsaras G , Chatziioannidis I . 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