Eustachian tube function can be tested using:

The function of the Eustachian tube can indeed be assessed using various methods, all of which serve to evaluate its ability to equalize pressure between the middle ear and the atmosphere. The Valsalva maneuver involves the patient forcibly exhaling against a closed airway, which can help to open the Eustachian tube and evaluate its functionality. Catheterizing the tubes allows for direct assessment of the Eustachian tube by introducing a small catheter, providing information on its patency and function. Impedance audiometry, also known as tympanometry, is a common test in audiology that measures the compliance of the tympanic membrane and indirectly assesses Eustachian tube function by analyzing how well pressure is equalized in the middle ear.

Since each of these methods can provide insights into how well the Eustachian tube is functioning, choosing “Any or all of these” reflects the comprehensive approach to evaluating this important structure in the auditory system.