title: Is uterine depth measurement by trans-vaginal ultrasound alone as accurate as measurement carried out by trans-abdominal ultrasound-guided trial transfer?
abstract: OBJECTIVE
  To assess the reliability of trans-vaginal-scan (TVS) in measuring the uterine depth (UD) in comparison with ultrasound-guided trial-transfer (UTT).
  
  
  METHODS
  This prospective study was conducted in 66 consecutive patients undergoing in-vitro fertilization and embryo transfer (IVF-ET). The study took place in a private IVF center in Jeddah, Saudi Arabia between November 2013 and January 2014. The patients underwent UD measurements using TVS and UTT, sequentially. All scans were performed by a single sonographer, and all UTT were carried out by a single physician who was blinded to the TVS measurement.
  
  
  RESULTS
  The median (95% confidence interval) UD measurement using the TVS method was 6.9 cm (5.0-12.5) and UTT was 7.1 cm (5.9-13.5), (p&lt;0.0001). Fifteen patients (22.7%) had a difference of &gt;1 cm between the 2 measurement modalities (group-B). When measured by UTT, 93.3% of patients in group-B had UD &gt;/-8cm, compared with 9.8% of patients in group-A, (p&lt;0.0001). Group-B had a significantly longer uterine cavity when measured by UTT (p&lt;0.0001), and a trend towards significance when measured by TVS (p=0.055). The TVS measurements generally underestimated UD when compared with UTT.
  
  
  CONCLUSIONS
  Trans-vaginal-scan is less reliable than UTT and should not be used as a substitute. Larger sample-size studies involving different personnel, and equipment is needed.
authors.affiliation: Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Umm Al-Qura University, Makkah, Kingdom of Saudi Arabia. Tel. +966 (12) 5270000. Fax. +966 (12) 5270001. E-mail. fawazedris@yahoo.ca.
authors.forename: Fawaz E
authors.initials: FE
authors.lastname: Edris
mesh_terms: D000328:Adult; D004624:Embryo Transfer / Q000379:methods*; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D011446:Prospective Studies; D015203:Reproducibility of Results; D018084:Ultrasonography, Interventional / Q000379:methods*; D014599:Uterus / Q000033:anatomy & histology / Q000000981:diagnostic imaging*