Speaking with the parents of a sick infant, Michael Argenyi, a medical student, could not understand why the child was hospitalized. During another clinical training session, he missed most of what a patient with a broken jaw was trying to convey about his condition.

His incomprehension, Mr. Argenyi explained, was not because of a deficiency in academic understanding. Rather, he simply could not hear.

Mr. Argenyi, 26, is legally deaf. Despite his repeated requests to use an interpreter during clinical training, administrators at the Creighton University School of Medicine in Omaha, Neb., have refused to allow it. They have contended that Mr. Argenyi, who is able to speak, communicated well enough without one and that patients could be more hesitant to share information when someone else was present. They added that doctors needed to focus on the patient (not a third party) to rely on visual clues to make a proper diagnosis.

Mr. Argenyi took a leave of absence at the end of his second year, in 2011, after suing Creighton for the right to finish his medical training with an interpreter. The case, scheduled to go to trial on Tuesday in Federal District Court in Omaha, is attracting the attention of the federal government and advocates who are concerned that it could deal a setback to continuing efforts to achieve equality for people with disabilities.