title: Ultrasound assessment of bladder volume: is it valid after delivery?
abstract: OBJECTIVE
  To assess the validity of a commercially available bladder volume scanner in the puerperium.
  
  
  METHODS
  A prospective blinded comparison of bladder volume measurement after vaginal delivery using the BladderScan bladder volume instrument (BVI) 3000 and Foley catheter; comparison using the intraclass correlation coefficient.
  
  
  RESULTS
  The mean difference between the two measurements was a 130-mL over-measurement by the bladder scanner (range: -156 mL to +422 mL). The intraclass correlation coefficient was 0.23 (95% confidence interval 0.00, 0.59).
  
  
  CONCLUSIONS
  The BladderScan BVI 3000 is not an accurate instrument to assess bladder volume the day after vaginal delivery. Some of the discrepancy might relate to use of the Foley catheter as the reference standard. Further comparison between the BladderScan and a short female catheter or real time ultrasound is indicated.
authors.affiliation: University of Queensland, Department of Obstetrics and Gynaecology, Gold Coast Hospital, Southport, Queensland, Australia. Lucinda_Pallis@health.qld.gov.au
authors.forename: Lucinda M
authors.initials: LM
authors.lastname: Pallis
authors.forename: Melissa
authors.initials: M
authors.lastname: Wilson
mesh_terms: D000328:Adult; D036861:Delivery, Obstetric; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D011237:Predictive Value of Tests; D011247:Pregnancy; D011446:Prospective Studies; D011644:Puerperal Disorders / Q000175:diagnosis* / Q000000981:diagnostic imaging; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016216:Ultrasonography, Prenatal / Q000295:instrumentation*; D001743:Urinary Bladder / Q000000981:diagnostic imaging* / Q000473:pathology; D014546:Urinary Catheterization; D014555:Urination Disorders / Q000175:diagnosis* / Q000000981:diagnostic imaging