Prader orchidometer
Pronunciation: PRAH-der or-ki-DOM-eh-ter
Standardized tool consisting of ellipsoid models used to assess testicular volume in pediatric patients.
Full Definition
A clinical assessment tool developed by Andrea Prader consisting of a series of ellipsoid models ranging from 1 to 25 milliliters in volume, used to estimate testicular size in boys. The orchidometer is essential for evaluating pubertal development, as testicular enlargement is typically the first sign of male puberty. A testicular volume of 4 mL or greater indicates the onset of puberty, while volumes below 4 mL suggest prepubertal status. The tool is also used to assess hypogonadism, delayed puberty, and response to treatment. Accurate measurement requires proper technique and comparison with the appropriate model that most closely matches the testicular size.
Usage
Usage note: Always specify the volume measurement in milliliters when documenting findings.
In Context
- "Testicular volume measured 3 mL bilaterally using the Prader orchidometer, consistent with prepubertal status." — Physical examination note
- "The Prader orchidometer remains the gold standard for clinical assessment of testicular volume." — Medical textbook