Iowa Code § 135B.22: Character of services.

Pathology and radiology services performed in hospitals are the product of the joint contribution of hospitals, doctors and technicians but these services constitute medical services which must be performed by or under the direction and supervision of a doctor, and no hospital shall have the right, directly or indirectly, to direct, control or interfere with the professional medical acts and duties of the doctor in charge of the pathology or radiology facilities or of the technicians under the doctor’s supervision. Nothing herein contained shall affect the rights of third parties as a result of negligence in the operation or maintenance of the aforesaid pathology and radiology facilities.