The Prader Orchidometer is a chain of 12 numbered beads of increasing size from 1 to 25 ml used to measure the volume of the human testicles. The beads are compared to the testicles of the patient and allowing a volume measurement to be recorded. Pre-pubertal sizes (yellow) are 1 to 3 ml, pubertal sizes are 4 to 12 ml (orange) and adult sizes are 15 to 25 ml (red).
Discrepancy of testicular size with other parameters of maturation can be an important clue to various diseases . Small testes can indicate either primary or secondary hypogonadism. Testicular size can help distinguish between different types of precocious puberty. Since testicular growth is typically the first physical sign of true puberty, one of the most common uses is as a confirmation that puberty is beginning in a boy with delay. Large testes (macroorchidism) can be a clue to one of the most common causes of fragile X syndrome.
The Prader Beads come with key card and carrying case. Ideal for endocrinology students and endocrinologists.
