['Abbreviated fatigue questionnaire': a practical tool in the classification of fatigue].

The 'Shortened fatigue questionnaire' (SFQ) is a short, reliable and easily used instrument to determine the intensity of the patient's bodily fatigue. It consists of four questions which the patient answers by checking an item at a 7-point scale ('I feel tired', 'I tire easily', 'I feel fit' and 'I feel physically exhausted'). The physician can then calculate a total score and compare it with the score in standard groups (standardized by load-bearing). The questionnaire can be completed simply and quickly. It constitutes a valuable addition in daily medical practice and in clinical scientific studies for the assessment of fatigue complaints.