What is the first step in the masking procedure for bone conduction thresholds?

The first step in the masking procedure for bone conduction thresholds involves starting the masker at the non-test ear (NTE) threshold plus an additional 10 dB, along with the level of over-ear (OE) compensation if applicable. This approach ensures that adequate masking is provided to prevent sound from the test ear from being perceived in the non-test ear, thereby allowing for accurate assessment of the bone conduction thresholds.

When the masker is set at the NTE threshold plus 10 dB, it accounts for individual variability in hearing sensitivity, which is crucial in preventing any cross-hearing that may affect the results. This level is determined based on standard audiological practices to ensure the masking is sufficient to truly isolate the thresholds being tested.

This step is foundational to avoid misleading results during the hearing assessment. Starting it any lower, as suggested by other options, may not effectively mask the sounds from the test ear, leading to inaccurate assessments of the patient's hearing capabilities.