Comparison of testicular volume differential calculations in adolescents with varicoceles.
OBJECTIVE
We aimed to develop a conversion formula between different calculations for testicular volume asymmetry.


METHODS
Male adolescents with varicoceles who underwent scrotal ultrasound were studied. Two formulas were analyzed: (1) testicular volume differential, TVDiff = (RTV - LTV)/(TTV), and (2) atrophy index, AI = (RTV - LTV)/(RTV). RTV, LTV, and TTV represent the right, left, and total testicular volume. Through transformations and regression a conversion formula between the calculations was derived.


RESULTS
Based on 248 ultrasounds, a clear relationship between the two formulas was demonstrated: AI = ln[(1.97 × TVDiff) + 1], (p < 0.0001).


CONCLUSIONS
Differential testicular volumes can easily be converted from one formula to another with near-perfect accuracy. The formulas are essentially identical and interchangeable.
Department of Urology, Naval Medical Center San Diego, 34800 Bob Wilson Drive, San Diego, CA 92134, USA. Electronic address: matthew.christman@med.navy.mil.
Matthew S
MS
Christman
The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
Stephen A
SA
Zderic
The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
Thomas F
TF
Kolon
D000293:Adolescent; D015331:Cohort Studies; D006801:Humans; D008297:Male; D009929:Organ Size; D012189:Retrospective Studies; D012611:Scrotum / Q000000981:diagnostic imaging / Q000254:growth & development*; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D013737:Testis / Q000000981:diagnostic imaging / Q000254:growth & development*; D018608:Ultrasonography, Doppler / Q000379:methods; D014646:Varicocele / Q000000981:diagnostic imaging* / Q000503:physiopathology
Adolescents; Scrotal ultrasound; Testicular volume differential; Varicocele