title: Is transabdominal sonography of the cervix after voiding a reliable method of cervical length assessment?
abstract: OBJECTIVE
  The purpose of this study was to assess the correlation and agreement between transvagi-nal and transabdominal cervical length measurement after bladder emptying as well as the feasibility of transabdominal sonography in cervical length screening.
  
  
  METHODS
  This was a prospective cohort study involving 287 participants (14-34 weeks' gestation) from January to December 2003. After voiding, transabdominal and transvaginal cervical length measurements were obtained. The optimal trans-abdominal technique was established during an unblinded series of transabdominal and transvaginal cervical length measurements (n = 96). The same measurements were obtained in 191 participants under a blinded 2-sonographer protocol. The transabdominal cervical length cutoff to ensure 100% sensitivity in detecting a short cervix (<or=2.5 cm) was determined.
  
  
  RESULTS
  There was no difference between mean transabdominal and transvaginal cervical lengths +/- SD (3.57 +/- 0.74 versus 3.61 +/- 0.74 cm; P = .20). The Pearson correlation coefficient was 0.824. The 95% tolerance interval for any paired observation (transabdominal minus transvaginal) was -0.92 to 0.84 cm. All transvaginal cervical lengths of 2.5 cm or less were associated with paired transabdominal cervical lengths of 3 cm or less.
  
  
  CONCLUSIONS
  With an optimal sonographic technique, postvoid transabdominal cervical measurement shows a close correlation and agreement with transvaginal assessment and is useful for cervical length screening.
authors: Department of Obstetrics and Gynecology, University of California, Irvine Medical Center, Orange, California 92868, USA. llspaylor@yahoo.com
authors: Lisa L
authors: LL
authors: Saul
authors: James T
authors: JT
authors: Kurtzman
authors: Cristiane
authors: C
authors: Hagemann
authors: Mark
authors: M
authors: Ghamsary
authors: Deborah A
authors: DA
authors: Wing
mesh_terms: D000005:Abdomen / Q000000981:diagnostic imaging*; D000328:Adult; D002584:Cervix Uteri / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D011247:Pregnancy; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016216:Ultrasonography, Prenatal / Q000379:methods*; D001743:Urinary Bladder / Q000000981:diagnostic imaging*; D014554:Urination