The invention regards a method for measuring audio response of a real ear using the microphone (3) of a hearing aid (1) of an end user. The following sequence of steps is performed: provide a sound tight connection between the hearing aid microphone and a first end of a soundguiding flexible tube (2), disable any further microphones in the hearing aid, place a second end of the tube (2) at the location wherefrom sound is to be captured, provide an audio sound signal at the area of the second end of the tube and record the sound guided through the tube to the microphone (3) of the hearing aid, process the recorded sounds to retrieve sound level values. Hereby real ear measurements may be gained with a hearing aid (1) with only one microphone (3) without any additional measuring equipment.
