<unk>  is a diagnostic measurement of cross sectional<unk> ea and length of the nose and the nasal cavity through<unk>  reflections. It can be used to measure nasal anatomical landmarks, and nasal airway changes in response to allergen provocation tests. The size and the pattern of the reflected sound waves provide information on the structure and dimensions of the nasal cavity, with the time delay of reflections correlating with the distance from the nostril.
Acoustic rhinometry
Tympanometry
Tympanocentesis
Nasopharyngoscopy
Pneumatic otoscopy
Nasal provocation test
Throat culture
Laryngoscopy