Weight loss and cachexia are common characteristics associated with the cancer patient. Although the wasted appearance seems the same in each person, the causes are varied. Studying a patient's history and identifying surgical causes to weight loss or weight loss as a result of treatment complications assists in the consideration of nutritional support. Nutritional parameters combined with the oncology nurse's knowledge of the patient, disease process, and treatment side effects place the nurse in the position to help identify options for nutritional support. The oncology nurse's expertise assists in the decision making process, since it is often not appropriate to institute nutritional support in the inpatient setting nor extend it to the home situation. Objective assessment parameters for home parenteral nutrition assist the nurse in making some of these decisions. The conflicts that arise within the decision making process are usually not clearcut nor easily resolvable. Home parenteral nutrition brings to the forefront requirements and variables that are often not consciously addressed when hyperalimentation is instituted in the inpatient setting.