PURPOSE: We compared 3 commonly used clinical methods to measure testicular volume. MATERIALS AND METHODS: The volumes of 151 testes in 76 adults treated for cryptorchidism during childhood were measured with an ordinary ruler, an orchidometer and ultrasonography. RESULTS: Mean testicular volume was 15 +/- 8 ml. (standard elevation) measured with a ruler, 16 +/- 7 ml. with an orchidometer and 17 +/- 8 ml. with ultrasonography. The correlation among methods was significant. CONCLUSIONS: To measure testicular size use of an ordinary ruler is recommended for clinical purposes because of its simplicity, availability and low cost.
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