Which of the following coordination tests involves standing on one leg?

The coordination test that involves standing on one leg is the Romberg test. This test assesses a person's balance and proprioception, which is the ability to sense the position of their body parts in space. During the Romberg test, the individual is asked to stand with their feet together and then be instructed to close their eyes. This challenges the body's ability to maintain balance using visual, vestibular, and proprioceptive inputs.

When one leg is raised and held off the ground, it emphasizes stability further by reducing the base of support. The test is particularly useful in identifying issues related to the central nervous system, such as problems with the cerebellum or vestibular function, as balance depends heavily on these systems.

The other tests mentioned do not specifically involve standing on one leg and focus on different aspects of coordination and balance, which helps to clarify why the Romberg test is the one that fits the description given in the question.