The Modified Fatigue Impact Scale (MFIS) is a Patient reported outcome assessing the impact of fatigue over the past four weeks. The questionnaire is comprised of 21 questions covering three domains (physical, cognitive, and psychosocial subscales). The assessment is graded on a 5 point Likert scale (0-4). The MFIS' range of scores is from 0-84 with higher scores indicating greater impact/worse fatigue. The range of scores for the physical, cognitive, and psychosocial subscales are 0-36, 0-40, and 0-8 respectively. Greater scores indicate greater/worse impact of fatigue.