There are multiple definitions:

1. mean fluorescence intensity(English)

   • HLA, SAB, MCFS, BM, DC, PIM, SCF
   • Fluorescence, Imaging, Transplantation, Cell biology, Biochemistry
   • https://doi.org…rre.2013.07.001
   • https://doi.org/10.1002/cbf.3737

2. mean fold increase(English)

   • GMT, post-GMT, PR, RR, SPR
   • Vaccination, Virology
   • https://doi.org…res.2004.02.024
   • https://doi.org…0875-007-9100-4

3. Multidimensional Fatigue Inventory(English)

   • has 20 questions that measure 5 different domains of fatigue. The general fatigue domain has previously been shown to differentiate between patients with vasculitis and healthy controls. Occasionally, only the general domain items are used. The general domain consists of 4 questions: (1) I feel fit, (2) I feel tired, (3) I am rested, and (4) I tire easily. Each item is scored on a 5-point Likert scale (1 = strongly disagree to 5 = strongly agree), with questions 1 and 3 reverse-scored. The 4 items are summed to generate a composite score. Scores range from 4 to 20, with higher scores representing a higher level of fatigue
   • DASI, PGA, PHQ-4, QOL
   • Fatigue, Scoring systems/scales
   • https://doi.org…9/jrheum.190828