Patients living with cancer may have different nutritional challenges, and many of them experience weight loss. Nutritional screening is a simple process to identify individuals at risk for malnutrition or individuals that are malnourished. The Patient-Generated Subjective Global Assessment (PG-SGA) short form has been used as a tool in many clinical trials with cancer patients. Despite the extensive use and validation of PG-SGA with regard to predictive and construct validity, experiences from research have questioned how well it works with regard to patient use and understanding, i.e. the tool's face validity. Little has been reported about the patients' perspective, i.e. reports about the way patients perceive, interpret, and respond to the items in questionnaires are less common. To capture the patients' perspective, it is essential that patients' are involved in development of patient-reported outcomes measurements because only patients can determine if the questionnaire captures these outcomes in a comprehensible and understandable manner. The overall aim of this study is to investigate whether patients interpret and use the PG-SGA as intended by researchers and clinicians.