ABSTRACT
This chapter discusses the important investigations that are performed largely or entirely within ENT practice as well as those that are unlikely to be encountered in other spheres of medicine. The hearing tests carried out in the ENT clinic can determine the degree of hearing impairment and also the type of hearing loss that is conductive or sensorineural. Patients often complain of nasal obstruction; this is usually simple to assess on clinical examination. Therefore, formal testing of nasal airflow is rarely performed in routine ENT practice. magnetic resonance imaging scanning has become the primary investigation in the diagnosis of suspected acoustic neuromas. Other investigations such as X-ray tomography and Computed tomography (CT) scanning are largely obsolete. Despite these shortcomings, CT scanning has revolutionized our understanding of sinus disease and is an invaluable tool in the investigation, diagnosis and planning of sinus operations.
