Document Detail

Cervical assessment at the routine 23-weeks' scan: problems with transabdominal sonography.
MedLine Citation:
PMID:  10895447     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To compare transabdominal and transvaginal sonographic measurements of cervical length in pregnancy and examine the factors that may influence these measurements. METHODS: The study population consisted of 149 women with singleton pregnancies attending for routine ultrasound examination at 23 weeks of gestation. In all women the cervix was successfully visualized by transvaginal sonography and cervical length was measured after emptying of the bladder. This measurement was compared to that obtained by transabdominal sonography. In addition the ability to visualize the cervix transabdominally was examined in relation to body mass index (BMI), bladder volume and cervical length. RESULTS: The percentage of cases in which the cervix could be seen transabdominally increased from 42% for bladder volume of < 50 ml to 73% for volumes > 150 ml, and 13% for cervical length < 20 mm to 51% for lengths > 40 mm. The ability to visualize the cervix was unrelated to BMI. Although there was a significant association between measurements taken transabdominally with those made transvaginally, measurements taken with a full bladder were significantly longer than those with an empty bladder. CONCLUSION: The aim of cervical assessment in pregnancy is to identify women with a short cervix because they are at high risk of preterm delivery. This aim can not be fulfilled by transabdominal sonography. Such a scan fails to visualize the cervix in a high proportion of cases and in particular those with a short cervix. Furthermore, successful visualization requires a full bladder which falsely increases cervical length.
M S To; C Skentou; S Cicero; K H Nicolaides
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology     Volume:  15     ISSN:  0960-7692     ISO Abbreviation:  Ultrasound Obstet Gynecol     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2000-11-20     Completed Date:  2000-11-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9108340     Medline TA:  Ultrasound Obstet Gynecol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  292-6     Citation Subset:  IM    
Harris Birthright Research Centre for Fetal Medicine, King's College Hospital, London, UK.
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MeSH Terms
Body Mass Index
Cervix Uteri / ultrasonography*
Ultrasonography, Prenatal* / methods
Urinary Bladder / ultrasonography

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