We report here three clinical cases as exemples of our rich and frequent collaboration between the department of psychiatry and the department of medecine, nephrology and hemodialysis. This work can serve as a basis for further reflection in order to improve mutual demands. We based our description on three patients chosen for their homogeneity in demand, rapidity of evaluation, the same clinician who evaluated the demand. Either case: a 42-year-old woman, who was admitted for alteration of general state, severe headaches and chronic addiction to alcohool, 71-year-old woman sufferring from recurrent unipolar depression who came for somatic exploration and severe weight loss or 55-year-old man who was transferred from cardio-pulmonary intensive care unit after a volontary ingestion of neuroleptic- were reevaluated by the psychiatrist and the special follow-up was indicated as the patient was discharded from internal medecine department. We were interested in studying how important to the patient this indication turned to be on time.