Pure tone audiometry is the most commonly administered hearing test for patients. The purpose of this test is to evaluate hearing thresholds and sensitivity at frequencies critical for communication. During the test, short-duration pure tone sounds are presented to each ear separately at various sound levels and pitches. The patient is asked to signal the sounds by pressing a button as soon as they hear them. The determined hearing thresholds are recorded on an audiogram. Each ear is measured separately for both air conduction and bone conduction. These measurements allow for easy identification of which ear and which part of the auditory system the patient's hearing loss has occurred in.