Diagnosis 
Otoscopy and ear microscopy is used to evaluate the changes in the external ear canal and eardrum.
Other tests, such as tympanometry, may also be used to examine the middle ear.
Tympanometry measures pressure differences between the middle ear and outer ear by measuring how easily the eardrum vibrates back and forth.
To measure whether the fluid is causing hearing loss, a separate hearing test or audiometry is necessary.
Treatment

Most cases of glue ear don’t require treatment as the condition will improve spontaneously, usually within three months. Nasal lavage with saline solution and exercises with a nasal balloon are recommended, to ensure a quicjk recovery. 

Treatment is normally only recommended when symptoms last longer than three months and the hearing loss is thought to be significant enough 

to interfere with a child’s speech and language development.

In these circumstances, glue ear can usually be treated using minor surgery, which involves placing small tubes (grommets) in the ear to help drain away the fluid.

Sometimes adenoid hyperplasia may cause obstruction of the Eustachian tubes and therefore be the reason for glue ear. In these cases adenoidectomy is performed and very often at the same time as a grommet insertion.