{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T10:22:13Z","timestamp":1777890133494,"version":"3.51.4"},"reference-count":0,"publisher":"S. Karger AG","license":[{"start":{"date-parts":[[2009,12,22]],"date-time":"2009-12-22T00:00:00Z","timestamp":1261440000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"},{"start":{"date-parts":[[2009,12,22]],"date-time":"2009-12-22T00:00:00Z","timestamp":1261440000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Gyn\u00e4kol Geburtshilfliche Rundsch"],"abstract":"<jats:p>Biological gestational age differs from calendar age, which is only its measurement. In spite of that in many countries all over the world, the rule for termination of pregnancy exclusively because its calendar duration is longer than 293 days (so-called postterm pregnancy) is widely applied. Constant increase in the blood oxytocinase level of pregnant women, just like the sonographic measurements of fetal bodies, proves the appropriate development of pregnancy with all the more accuracy, the more similar the subsequent values of the enzymatic and ultrasonographic determinations. From medical and ethical points of view the \u2018obstetrical\u2019 scale comprising sequential periods\u2019 pre-, at- and post-term\u2019 is an incorrect way of calculating the duration of pregnancy. Gynecologists have to use the word \u2018term\u2019 only to describe an individual\u2019s date of fetal maturity (birth-date) and the possible true pre- and post-term of an individual should be placed within as well as outside the normal range of deliveries.<\/jats:p>","DOI":"10.1159\/000271854","type":"journal-article","created":{"date-parts":[[2009,12,23]],"date-time":"2009-12-23T03:12:31Z","timestamp":1261537951000},"page":"95-99","source":"Crossref","is-referenced-by-count":0,"title":["Biological Gestational Age and Its Calendar Assessment with Ultrasound"],"prefix":"10.1159","author":[{"given":"R.","family":"Klimek","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"127","published-online":{"date-parts":[[2009,12,22]]},"container-title":["Gyn\u00e4kologisch-geburtshilfliche Rundschau"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/karger.com\/article-pdf\/doi\/10.1159\/000271854","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T05:29:27Z","timestamp":1777613367000},"score":1,"resource":{"primary":{"URL":"https:\/\/karger.com\/article\/doi\/10.1159\/000271854"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2009,12,22]]},"references-count":0,"URL":"https:\/\/doi.org\/10.1159\/000271854","archive":["Portico"],"relation":{},"ISSN":["1018-8843","1423-0011"],"issn-type":[{"value":"1018-8843","type":"print"},{"value":"1423-0011","type":"electronic"}],"subject":[],"published":{"date-parts":[[2009,12,22]]}}}