Baseline revision is indicated in two circumstances under OSHA (29 CFR 1910.95(g)(9)): when a threshold shift is determined to be persistent (it has not resolved after retest), and when a subsequent audiogram shows significant improvement over the established baseline. The decision to revise a baseline audiogram must be made by a qualified professional — an audiologist, otolaryngologist, or physician. It is not a software function.
Baseline revision is indicated in two circumstances under OSHA (29 CFR 1910.95(g)(9)): when a threshold shift is determined to be persistent (it has not resolved after retest), and when a subsequent audiogram shows significant improvement over the established baseline. The decision to revise a baseline audiogram must be made by a qualified professional — an audiologist, otolaryngologist, or physician. It is not a software function. The operational implication: programs that lack access to a professional reviewer may be unable to revise baselines appropriately, which causes either persistent false STSs (if improvement goes unrecognized) or missed STSs (if a persistent shift becomes the new assumed baseline without formal revision).
