title: Correlation of ultrasonographic and orchidometer measurements of testis volume in adults.
abstract: OBJECTIVE
  To determine the correlation between testicular volume measured with an orchidometer or high-resolution scrotal ultrasonography (US) with colour-flow Doppler analysis.
  
  
  METHODS
  In all, 159 men (mean age 36.6 years) presenting for infertility evaluation underwent both a physical examination by a one experienced examiner and high-resolution US with colour-flow Doppler analysis. An orchidometer was also used to measure testicular volume after stretching the scrotal skin tightly over the testis and after warming with a heating pad. The US was interpreted by a radiologist who had no knowledge of the orchidometer estimates. The volume was calculated as 0.71 x length x width x height.
  
  
  RESULTS
  For the right testes the mean orchidometer and US estimates were 18.4 and 18.3 mL, yielding a correlation coefficient of 0.72 (r (2) = 0.52, P < 0.01). On the left the respective values were 17.1 and 16.9 mL, with a correlation coefficient of 0.69 (r (2) = 0.48, P < 0.01).
  
  
  CONCLUSIONS
  Orchidometer estimates of testicular volume correlate closely and very significantly with US estimates in adults. In the hands of an experienced examiner orchidometer measurements provide an accurate, rapid and inexpensive assessment of testicular volume.
authors.affiliation: Center for Male Reproductive Medicine and Microsurgery, Cornell Institute for Reproductive Medicine and James Buchanan Brady Foundation Department of Urology, New York Weill Cornell Medical Center, New York, NY, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Schiff
authors.forename: P S
authors.initials: PS
authors.lastname: Li
authors.forename: M
authors.initials: M
authors.lastname: Goldstein
mesh_terms: D000328:Adult; D006801:Humans; D007248:Infertility, Male / Q000000981:diagnostic imaging / Q000473:pathology*; D008297:Male; D011446:Prospective Studies; D013737:Testis / Q000000981:diagnostic imaging / Q000473:pathology*; D018615:Ultrasonography, Doppler, Color