The Modified Medical Research Council (mMRC) Dyspnea Scale is a clinical calculator used to assess the level of breathlessness in patients with respiratory diseases, particularly chronic obstructive pulmonary disease (COPD). The scale ranges from 0 to 4, with 0 indicating no breathlessness except with strenuous exercise and 4 indicating breathlessness while at rest. The mMRC Dyspnea Scale is a simple and effective tool for evaluating the impact of dyspnea on daily activities and quality of life. It is also used to guide treatment decisions and predict health outcomes in patients with COPD. There are no specific exclusion criteria for its use, but it may be less accurate in patients with conditions that cause dyspnea other than COPD.

Modified Medical Research Council (mMRC) dyspnea scale

# Criteria
 ## Assessment of dyspnea
A. Dyspnea only with strenuous exercise (0)
B. Dyspnea when hurrying or walking up a slight hill (+1)
C. Walks slower than people of the same age because of dyspnea or has to stop for breath when walking at own pace (+2)
D. Stops for breath after walking 100 yards (91 m) or after a few minutes (+3)
E. Too dyspneic to leave the house or dyspneic when dressing or undressing (+4)

# Conditions
- score == 0
- score == 1
- score == 2
- score == 3
- score == 4