Iowa Code § 85B.10
The employer shall communicate to the employee, in writing, the results of an audiometric examination or physical examination of an employee which reflects an average hearing level in one or both ears in excess of twenty-five decibels for the test frequencies of five hundred, one thousand, two thousand, and three thousand Hertz, as soon as practicable after the examination. The communication shall include the name and qualifications of the person conducting the audiometric examination or physical examination, the site of the examination, the kind or type of test or examinations given, the results of each and the average decibel hearing level, for the four frequencies, in each ear, and, if known to the employer, whether the hearing loss is sensorineural and, if the hearing loss resulted from another cause, the cause.
Iowa Code § 85B.10
98 Acts, ch 1160, §8