The foundational audiometric measurement against which all subsequent audiograms are compared for STS detection. Must be preceded by at least 14 hours without workplace noise exposure. Must be established within 6 months of an employee’s first exposure at or above the action level (12 months for mobile van programs, with HPD use required during the gap). (29 CFR 1910.95(g)(5))
SHOEBOX: SHOEBOX Data Management PLUS manages baseline assignment and revision per employee, with triage routing to Audiology Reviewers when revision is indicated.
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