(1)    The affiliated credentialing board shall conduct or arrange for examinations for dietitian certification at least semiannually and at times and places determined by the affiliated credentialing board, and shall provide public notice of each examination at least 90 days before the date of the examination.
   (2)   Examinations held under sub. (1) shall consist of written or oral tests, or both, requiring applicants to demonstrate minimum competency in subjects substantially related to the practice of dietetics.