Ohio Rev. Code § 4753.14: Referrals.

An audiologist shall administer tests of vestibular function only to patients who have been referred to him by a person authorized under Chapter 4731. of the Revised Code to practice medicine and surgery or osteopathic medicine and surgery.

If an audiologist administers an audiometric test for tinnitus and his examination or evaluation of the patient reflects the presence of otological or systemic disease, the audiologist shall promptly refer the patient to a person authorized under Chapter 4731. of the Revised Code to practice medicine and surgery or osteopathic medicine and surgery.