The State of Maryland Audiologists, Hearing Aid Dispensers and Speech-Language Pathologists Regulations specifically state the testing requirements for fitting a hearing aid. Licensed providers must minimally test: Air conduction at 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz (with appropriate masking, when needed) Bone conduction at 500 Hz, 1000 Hz, 2000 Hz, and 4000 […]