Accuracy of orchidometry in boys with varicocele

Appropriate caution should be exercised when relying solely on orchidometric evaluation of the testis. Rochester orchidometry in general appears to overestimate testis size, and there is wide variability in the estimation. In clinical practice, the sensitivity of Rochester orchidometry is modest in detecting a 20% testis volume differential; this difference would be missed in approximately two out of three of boys screened with orchidometry alone.535Figure. The left portion of the figure displays the cohort characteristics including age, grade of varicocele, and testis size. The right portion of the figure shows the sensitivity and specificity of Rochester orchidometry in detecting a 20% testis volume differential with ultrasound as the reference standard.