Orchidometer

Orchidometer is a medical instrument used by doctors to measure the volume of the testicles. The device, which was invented by Swiss pediatric endocrinologist Andrea Prader, is used in pediatric and adolescent medicine to assess the stage of sexual maturation.

Overview

The Orchidometer is a chain of twelve numbered wooden or plastic beads of increasing size from about 1 to 25 milliliters. Doctors use the beads to compare the size and volume of the testicles during a physical examination. The orchidometer can be used to assess testicular volume, which can be a sign of certain medical conditions or the onset of puberty.

Use in Medicine

In medicine, the orchidometer is used in pediatric and adolescent medicine to measure testicular volume, indicating the onset of puberty. A volume of less than 4 ml indicates prepubertal status. The onset of puberty is defined as an increase to 4 ml or more. The testicle's most rapid growth occurs during Tanner stage IV of puberty.

Limitations

While the orchidometer is a practical tool, it is not always accurate. The actual volume can be calculated using ultrasonography which is more accurate than physical examination with an orchidometer.

See Also

• Tanner stage
• Puberty
• Testicle

References

Orchidometer Resources
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