The Culture and Sensitivity Ear Swab is a test that is performed on a sample of swab taken from the ear. The test helps in determining and measuring the level of Culture of the pathogenic organism in the ear swab. The test helps to detect ear infection and also during an after the treatment of Ear Infection. Your doctor may ask you to undergo the test if your ear infection is not healing or getting better with treatment, you have an infection in your outer ear canal, or if you have an ear infection with drainage or ruptured eardrum.