Audiometric testing shall take place in a test environment meeting the criteria for background noise in accordance with prevailing hearing related industry standards.

When a customer is home-bound and not able physically or psychologically to receive services in an office setting or it is geographically inconvenient to do so, the dispenser must arrive at the customer's residence with the proper calibrated equipment and a sound level meter to measure ambient noise in the room and be able to perform the test where the ambient sound is not so loud as to interfere with the testing. If the prevailing hearing related industry standards can not be met, such fact must be noted on the audiogram.

In such settings as a nursing home, the dispenser must have the proper equipment and the ambient sound in the site of testing must be such that it does not interfere with the testing. If the prevailing hearing related industry standards can not be met, such fact must be noted on the audiogram.