During a hearing test, headphones or ear plugs are worn and generally the individual sits in a sound booth so that any ambient noise is minimized.
A hearing professional will likely use an audiometer, a machine that produces pure tones of different frequencies and intensities. The individual is asked to listen, first with one ear, and then the other, to a series of pure tones, signaling when he/she hears each tone.
The tones begin to decrease in intensity levels until the individual can no longer hear them—a point known as your “hearing threshold.”
An audiogram is used to plot the individual’s hearing threshold at various frequencies from 250 to 8000, the range that is characteristic of human speech.
Understanding an Audiogram
The symbols on an Audiogram represent the quietest level the individual responded to at each frequency during the hearing test.The Xs are the responses for the left ear. The Os are the responses for the right ear. The Ss are the responses through the speakers (this provides information about how well the individual hears when listening with both ears, or about the better hearing ear, if the ears don’t hear the same)