Iowa Code § 85B.7
Compensation is not payable to an employee who willfully fails to submit for reasonable periodic physical and audiometric examinations. Reasonable written notice of the dates and times of examinations required by the employer shall be given the employee. Examinations shall be scheduled during times the employee, examining personnel, and examination facilities are reasonably available. Physical and audiometric examinations shall be at the expense of the employer. The employee shall be compensated for any time lost from work occasioned by employer examinations. Compensation is not payable to an employee if the employee fails or refuses to use employer-provided hearing protective devices required by the employer and communicated in writing to the employee at the time the employee is employed or at the time the protective devices are provided by the employer.
Iowa Code § 85B.7