{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,10]],"date-time":"2025-12-10T21:13:22Z","timestamp":1765401202899,"version":"3.46.0"},"reference-count":0,"publisher":"BMJ","issue":"6190","license":[{"start":{"date-parts":[[1979,9,8]],"date-time":"1979-09-08T00:00:00Z","timestamp":305596800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.bmj.com\/company\/legal-information\/terms-conditions\/legal-information\/tdm-licencepolicy"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Br Med J"],"published-print":{"date-parts":[[1979,9,8]]},"abstract":"<jats:p>A study was made of 94 sets of twins born during 1975-8. Nine of these sets had not been diagnosed before labour started. Of the others, 75 were diagnosed as a result of clinical suspicion and 10 were diagnosed unexpectedly during the antenatal period, nine by ultrasonic examination. Thus, while ultrasonic examination has substantially reduced the incidence of undiagnosed twins, a fifth of all patients who had ultrasonography performed in the presence of a twin pregnancy were reported on at least one occasion to have a singleton pregnancy. Ultrasonography must be performed at least twice, therefore, before a multiple pregnancy can be confidently excluded.<\/jats:p>","DOI":"10.1136\/bmj.2.6190.593","type":"journal-article","created":{"date-parts":[[2009,4,2]],"date-time":"2009-04-02T18:32:30Z","timestamp":1238697150000},"page":"593-594","source":"Crossref","is-referenced-by-count":3,"title":["Diagnosis of multiple pregnancy."],"prefix":"10.1136","volume":"2","author":[{"given":"G J","family":"Jarvis","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[1979,9,8]]},"container-title":["BMJ"],"original-title":[],"language":"en","link":[{"URL":"http:\/\/data.bmj.org\/tdm\/10.1136\/bmj.2.6190.593","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bmj.2.6190.593","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,12,10]],"date-time":"2025-12-10T21:10:28Z","timestamp":1765401028000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.bmj.com\/lookup\/doi\/10.1136\/bmj.2.6190.593"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1979,9,8]]},"references-count":0,"journal-issue":{"issue":"6190","published-online":{"date-parts":[[1979,9,8]]},"published-print":{"date-parts":[[1979,9,8]]}},"alternative-id":["10.1136\/bmj.2.6190.593"],"URL":"https:\/\/doi.org\/10.1136\/bmj.2.6190.593","relation":{},"ISSN":["0007-1447","1468-5833"],"issn-type":[{"type":"print","value":"0007-1447"},{"type":"electronic","value":"1468-5833"}],"subject":[],"published":{"date-parts":[[1979,9,8]]}}}