The State Board of Human Resources, in conference with the commissioner, shall determine from time to time the scope and kinds of medical assistance for the aged which the department will administer. This determination shall be made with due regard to:
(1) The amount of state and federal funds available for this purpose;
(2) The most pressing medical needs of the aged not receiving old age pensions but without sufficient income and resources to meet the costs of necessary medical services; and
(3) The assurance that persons in similar circumstances will receive equitable treatment throughout the state.