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![Reid's index][1]
[1]: http://www.pathology-india.com/ReidIndex.JPG
The Reid Index is the ratio of the thickness of the glands (b-c) to that of the bronchial wall (basement membrane to inner perichondrium) (a-d).

Hyperplasia and hypertrophy of mucous glands as in chronic bronchitis increase the Reid Index beyond the normal value.
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by Medical student (529 points)
Reid index = Thickness of submucosal glands / Wall thickness i.e. Epithelium to cartilage
Normally it is 0.4
Increased in chronic bronchitis due to hypertrophy and hyperplasia of bronchial submucosal glands
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