mMRC Dyspnea Scale

The mMRC (modified Medical Research Council) dyspnea scale subjectively classifies the severity of dyspnea in patients with chronic obstructive pulmonary disease (COPD). The higher the degree, the more severe the shortness of breath. This can be used to estimate the risk of a COPD exacerbation. Alternatively, the «COPD Assessment Test™» (CAT) provides a more detailed classification.


mMRC: Grade

Grade Symptoms Description
0 Little Dyspnea only with strenuous exercise
1 Mild Dyspnea when hurrying or walking up a slight hill
2 Moderate Walks slower than people of the same age because of dyspnea or has to stop for breath when walking at own pace
3 Many Stops for breath after walking just under 100 m (100 yards) or after a few minutes
4 Very much Too dyspneic to leave house or breathless when dressing
  1. Mahler DA, Wells CK. Evaluation of clinical methods for rating dyspnea. Chest 1988; 93: 580-586

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