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Background Several professional societies have established nutrition guidelines for patients undergoing HSCT. We surveyed HSCT programs to understand how these compare with clinical practice. Methods Qualitative surveys were emailed to HSCT dietitians. Surveys addressed malnutrition screening; dietary recommendations including nutrition support, graft-versus-host disease (GVHD), immune enhancing nutrients, and prebiotics/probiotics; and nutrition-related preventive care screening. Results Twenty adult programs (19 United States (US), 1 Australia) and 3 pediatric programs (3 US) responded. Annual volume across the 22 US programs was 5405 patients, representing 25% of all transplants in the US. Nineteen programs (83%) follow guidelines for nutrition screening and fourteen for nutrition therapy in the inpatient setting (Table 1); six (26%) follow guidelines for screening and therapy in the outpatient setting. All programs adhere to food safety recommendations and 5 (22%) have additional institutional precautions. However, only 2 programs (9%) report frequent adherence to guidelines for use of enteral nutrition. While there are no guidelines for GVHD diet and uncertainty over alternative nutrition practices, 8 programs (35%) follow a stepwise GVHD diet; 4 (17%) allow immunonutrition supplements; 2 (9%) allow prebiotics, and 7 (30%) allow probiotics after the resolution of neutropenia. With regard to adherence to preventive screening recommendations, only 4 programs (17%) screen for diabetes, 6 (26%) screen for hyperlipidemia, and none screen for abdominal obesity. There are no guidelines for vitamin D deficiency screening, but 10 programs (43%) screen for this. Discussion Wide variations in nutrition practices exist across HSCT programs. Similarly, with the exception of food safety recommendations, there are also wide variations in adherence to established nutrition guidelines. The use of enteral nutrition and preventive screening is particularly varied. Efforts are needed to understand barriers to guideline implementation and their correlation to patient outcomes. Further research is needed regarding new interventions such as immunonutrition, prebiotics, and probiotics. [ABSTRACT FROM AUTHOR]