Modified Fatigue Impact Scale (MFIS)
What It Measures
The MFIS measures how much fatigue is getting in the way of a person's life — and, unusually for a fatigue measure, it treats cognitive fatigue as its own thing rather than folding it into physical tiredness.
Twenty-one statements ask how often fatigue has affected the person over the past four weeks, each rated from never to almost always. Nine physical items cover stamina, effort, and coordination. Ten cognitive items cover thinking clearly, concentrating, remembering, and organizing thoughts. Two psychosocial items cover the effect on relationships and social life. Subscales run 0 to 36, 0 to 40, and 0 to 8, summing to a total out of 84. Higher scores mean fatigue is having more impact.
Further Reading
Additional Notes
Licensing Notes: The MFIS was abbreviated from the 40-item Fatigue Impact Scale. It is reproduced across clinical resources and trial protocols without a posted fee.
