title: Blinded comparison of cervical portio length measurements by digital examination vs Cervilenz.
abstract: OBJECTIVE
  Cervical length (CL) examinations may identify patients in preterm labor or those who may benefit from prophylactic therapy. We sought to compare the accuracy of clinician digital CL examinations with objective measurements using the Cervilenz device in women presenting with symptoms of preterm labor.
  
  
  METHODS
  Forty-two patients with singleton gestation from 24 to 34 weeks' gestation and cervical dilation less than 3 cm underwent speculum examination and Cervilenz measurement. A second examiner, blinded to results, digitally measured CL. Pearson's correlation coefficient, Student t tests and McNemar's tests were used to compare digital and Cervilenz measures.
  
  
  RESULTS
  Digital CL was significantly less than Cervilenz (2.88 vs 3.40 cm; P < .001), and in 36% of subjects, this difference exceeded 1 cm. The discrepancy in CL estimates persisted whether women were multiparous or had soft cervices or a history of preterm delivery.
  
  
  CONCLUSIONS
  Digital assessment underestimates CL, whereas the Cervilenz device permits a visualized and objective CL measure in patients with preterm labor.
authors.affiliation: Department of Obstetrics and Gynecology, Harbor-UCLA Medical Center, Torrance, CA 90509, USA.
authors.forename: Richard M
authors.initials: RM
authors.lastname: Burwick
authors.forename: Gene T
authors.initials: GT
authors.lastname: Lee
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Benedict
authors.forename: Michael G
authors.initials: MG
authors.lastname: Ross
authors.forename: Siri L
authors.initials: SL
authors.lastname: Kjos
mesh_terms: D000328:Adult; D002584:Cervix Uteri / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D007752:Obstetric Labor, Premature / Q000517:prevention & control*; D010808:Physical Examination / Q000295:instrumentation* / Q000592:standards*; D011247:Pregnancy; D011295:Prenatal Care; D015203:Reproducibility of Results; D016037:Single-Blind Method; D013525:Surgical Instruments; D002581:Uterine Cervical Incompetence / Q000175:diagnosis*; D055815:Young Adult