Document Detail

Diagnosis of placenta previa by transvaginal sonographic screening at 12-16 weeks in a nonselected population.
MedLine Citation:
PMID:  9052586     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To evaluate the clinical significance of placenta previa at 12-16 weeks' gestation found by transvaginal sonographic screening. METHODS: An unselected population of 6428 pregnant women was scanned by transvaginal sonography during 1993-1994 to assess the gestational age and to diagnose major fetal anomalies. The location of the placenta was also recorded systematically. If the edge of the placenta extended over the internal cervical os, this distance was measured with electronic calipers. RESULTS: In 156 of 6428 patients (2.4%), the placental edge extended 15 mm or more over the internal cervical os at 12-16 weeks' gestation. Eight of these patients had placenta previa at delivery. Using this criterion at screening, two cases of placenta previa at delivery were missed. The frequency of placenta previa at delivery in this nonselected population was ten of 6428 (0.16%). CONCLUSIONS: The likelihood of placenta previa at delivery is 5.1% (95% confidence interval 2.2, 9.9) if the placenta extends at least 15 mm over the internal cervical os at 12-16 weeks' gestation.
P Taipale; V Hiilesmaa; P Ylöstalo
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Publication Detail:
Type:  Clinical Trial; Journal Article    
Journal Detail:
Title:  Obstetrics and gynecology     Volume:  89     ISSN:  0029-7844     ISO Abbreviation:  Obstet Gynecol     Publication Date:  1997 Mar 
Date Detail:
Created Date:  1997-03-20     Completed Date:  1997-03-20     Revised Date:  2009-10-26    
Medline Journal Info:
Nlm Unique ID:  0401101     Medline TA:  Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  364-7     Citation Subset:  AIM; IM    
Department of Obstetrics and Gynecology, Jorvi Hospital, Espoo, Finland.
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MeSH Terms
Confidence Intervals
Placenta Previa / ultrasonography*
Pregnancy Trimester, First
Pregnancy Trimester, Second
Ultrasonography, Prenatal* / methods

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