Copyright © 2015 - 2016 Radiology Universe Institute, a public benefit corporation. Testicular Volumes (W-ss)3 X 0.88 by Genital Stages. Exceptions are made for youngest and oldest age groups, where it not possible to center the regression. To use the Testicular Volume Calculator, enter a width for the testis in centimenters (enter one. This calculator performs multiple quadratic regressions, each quadratic regression centered at the age of interest, spanning relatively short age range (30 data points).Regression was applied to the power-transformed data, and standard deviation of the residuals was computed.Shapiro-Wilk test for normality of the transformed data residuals does not reject the hypothesis that the data derives from a normal distribution (P=0.177). Q-Q plot of the transformed data shows good agreement with Gaussian distribution. a cube-root of volume for each data point). To correct this, power transform was applied, using power of 0.3333 (i.e. Q-Q plot of the volume data residuals reveals deviation from a Gaussian distribution.This was done by software implementation of Hough Transform, with the expectation of finding filled circles. Derivation from the graph in Figure 1 was therefore necessary. Correlation with ultrasound or other modalities has not been established. CAUTION: Measurements were performed using mechanical calipers.The reason for this discrepancy is unknown, possibly due to overlapping of patients with identical ages and identical measured volumes, or possibly some patients older than 30 years did not appear on the graph. CAUTION: Authors report inclusion of 215 patients, but the graph presented in the above article contains only 175 data points (figure 1).Ellipsoid approximation is not suitable for estimation of testicular volumes, and multiplier of 0.71 is advised. A calculator, developed, will solve the problem of overestimation by the orchidometers and the external measurements, problems with the reference of values to age, and would permit assessment of the beginning and progression of puberty, of micro and macroorchidism, and other conditions mentioned.It's application to assessment of maturation, and its use in diagnosis of hypogonadism. Normal range data based on Rundle AT, Sylvester PE.
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