Case history and otoscopic examination
DOI link for Case history and otoscopic examination
Case history and otoscopic examination book
On the day of the test it is important that the employee is in a suitable condition for testing. In particular they should be:
It is important for the employee to be tested before any exposure to noise as recent noise exposure can cause temporary threshold shift, that is temporary deafness. Ideally there should have been no noise exposure for 48 hours before the test but, as this is often impossible to achieve, in practice 16 hours without noise exposure is generally considered acceptable. Temporary threshold shift is a temporary elevation in hearing threshold after exposure to noise. The degree of deafness depends on the noise level and its duration and the time away from the noise before testing. The greater the threshold shift, the longer the rest time is required before testing. Particular care must be taken when obtaining the first baseline audiogram as it is imperative that this is accurate. For tests after the first baseline, if it is not possible to test before
noise exposure on the day of test, the test results may still be acceptable if suitable ear protection has been worn and a rest period taken before testing. Further hearing assessment without noise exposure will have to be undertaken if the audiogram shows an identifiable threshold shift, in comparison to the previous audiogram.