Matthew S Christman1, Stephen A Zderic2, Thomas F Kolon2. 1. Department of Urology, Naval Medical Center San Diego, 34800 Bob Wilson Drive, San Diego, CA 92134, USA. Electronic address: matthew.christman@med.navy.mil. 2. The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
Abstract
PURPOSE: We aimed to develop a conversion formula between different calculations for testicular volume asymmetry. MATERIALS AND 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. Published by Elsevier Ltd.
PURPOSE: We aimed to develop a conversion formula between different calculations for testicular volume asymmetry. MATERIALS AND 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. Published by Elsevier Ltd.
Authors: Patricia S Cho; Richard N Yu; Harriet J Paltiel; Matthew A Migliozzi; Xiaoran Li; Alyssia Venna; David A Diamond Journal: Asian J Androl Date: 2021 Nov-Dec Impact factor: 3.285