FAU Advanced Health Assessment Practice Test

To accurately test for vibratory sense on the bony prominences of the extremities, which tuning fork frequency is typically used?

1. 512 Hz

2. 256 Hz

3. 1024 Hz

4. 384 Hz

The correct answer is: 1024 Hz

The typical tuning fork frequency used to accurately test for vibratory sense, especially on bony prominences, is 128 Hz. However, among the options given, the closest frequency to that which is commonly used for clinical assessment of vibration sense is 512 Hz. Using a tuning fork at 512 Hz is most effective because it falls within the range where vibratory sensation is best detected. The structure of the sensory neurons involved can effectively respond to vibrations around this frequency. It allows for reliable assessment as the fork’s vibrations will effectively stimulate the mechanoreceptors in the skin and deeper tissues, facilitating the identification of any deficits in vibratory sensation. Lower frequencies, like 256 Hz, may not provide the same level of sensitivity required for accurate assessment, while higher frequencies, such as 1024 Hz, can be more difficult for patients to perceive when testing vibratory sense. In summary, when assessing vibratory sensation, especially on bony prominences, 512 Hz is the appropriate and commonly utilized frequency, as it aligns with the physiological characteristics needed for optimal detection of vibration.