645—299.7 (147) Hearing tests supervised by a physician. For those persons conducting hearing tests under the direct supervision of a licensed physician and surgeon or licensed osteopathic physician and surgeon and functioning under Iowa Code section 147.152(1), “direct supervision” means the physician must order the hearing test performed on each individual patient and maintain control over the reading of the results. The person working under direct supervision of a physician must be able to show that the person did so at the direction of the physician and did nothing more than perform the hearing test. Direct supervision by a physician means the person conducting the hearing test does so in the usual location in which the physician performs medical services and sees patients. The physician must be readily available to respond to a request by a patient or the person conducting the hearing test.