{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T15:18:45Z","timestamp":1780586325366,"version":"3.54.1"},"reference-count":9,"publisher":"Elsevier BV","issue":"2","license":[{"start":{"date-parts":[[2001,8,1]],"date-time":"2001-08-01T00:00:00Z","timestamp":996624000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American Journal of Obstetrics and Gynecology"],"published-print":{"date-parts":[[2001,8]]},"DOI":"10.1067\/mob.2001.115991","type":"journal-article","created":{"date-parts":[[2002,8,24]],"date-time":"2002-08-24T22:14:26Z","timestamp":1030227266000},"page":"392-395","source":"Crossref","is-referenced-by-count":4,"title":["Evaluation of the prognosis of in vitro fertilization pregnancies with initially low serum human chorionic gonadotropin levels"],"prefix":"10.1067","volume":"185","author":[{"given":"Gary N.","family":"Frishman","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard J.","family":"Hackett","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Margaret","family":"McGrath","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William P.","family":"Metheny","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"78","reference":[{"key":"10.1067\/mob.2001.115991_bib1","first-page":"330","article-title":"Heart rate as a predictor of first-trimester spontaneous abortion after ultrasound-proven viability","volume":"78","author":"Achiron","year":"1991","journal-title":"Obstet Gynecol"},{"key":"10.1067\/mob.2001.115991_bib2","doi-asserted-by":"crossref","first-page":"304","DOI":"10.1016\/S0015-0282(16)60495-8","article-title":"Predicting pregnancy outcome after in vitro fertilization and embryo transfer using estradiol, progesterone, and human chorionic gonadotropin B-subunit","volume":"51","author":"Yamashita","year":"1989","journal-title":"Fertil Steril"},{"key":"10.1067\/mob.2001.115991_bib3","doi-asserted-by":"crossref","first-page":"373","DOI":"10.1016\/S0015-0282(16)55232-7","article-title":"Can a single, early quantitative human chorionic gonadotropin measurement in an in vitro fertilization-gamete intrafallopian transfer program predict pregnancy outcome?","volume":"58","author":"Heiner","year":"1992","journal-title":"Fertil Steril"},{"key":"10.1067\/mob.2001.115991_bib4","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1007\/BF02214122","article-title":"Predictive value of hCG level 14 days after embryo transfer","volume":"12","author":"Guth","year":"1995","journal-title":"J Assist Reprod Genetic"},{"key":"10.1067\/mob.2001.115991_bib5","doi-asserted-by":"crossref","first-page":"526","DOI":"10.1016\/S0015-0282(16)49282-4","article-title":"The predictive value of hCG B subunit levels in pregnancies achieved by in vitro fertilization and embryo transfer: an international collaborative study","volume":"45","author":"Confino","year":"1986","journal-title":"Fertil Steril"},{"key":"10.1067\/mob.2001.115991_bib6","doi-asserted-by":"crossref","first-page":"534","DOI":"10.3109\/00016349509024385","article-title":"Human chorionic gonadotropin patterns in early pregnancy after assisted reproduction","volume":"74","author":"Fridstrom","year":"1995","journal-title":"Acta Obstet Gynecol Scand"},{"key":"10.1067\/mob.2001.115991_bib7","doi-asserted-by":"crossref","first-page":"1169","DOI":"10.1016\/S0015-0282(16)55971-8","article-title":"Correlation between fetal heart rate, crown-rump length, and B-human chorionic gonadotropin levels during the first trimester of well-timed conceptions resulting from infertility treatment","volume":"59","author":"Rotsztejn","year":"1993","journal-title":"Fertil Steril"},{"key":"10.1067\/mob.2001.115991_bib8","year":"1998","journal-title":"ACOG Practice Bulletin"},{"key":"10.1067\/mob.2001.115991_bib9","doi-asserted-by":"crossref","first-page":"282","DOI":"10.1016\/S0015-0282(98)00441-5","article-title":"Risk factors for ectopic pregnancy in assisted reproduction","volume":"71","author":"Strandell","year":"1999","journal-title":"Fertil Steril"}],"container-title":["American Journal of Obstetrics and Gynecology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0002937801022803?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0002937801022803?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2019,5,9]],"date-time":"2019-05-09T10:55:18Z","timestamp":1557399318000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S0002937801022803"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2001,8]]},"references-count":9,"journal-issue":{"issue":"2","published-print":{"date-parts":[[2001,8]]}},"alternative-id":["S0002937801022803"],"URL":"https:\/\/doi.org\/10.1067\/mob.2001.115991","relation":{},"ISSN":["0002-9378"],"issn-type":[{"value":"0002-9378","type":"print"}],"subject":[],"published":{"date-parts":[[2001,8]]}}}