Question

What is reid index?

Answer 1

![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.

Answer 2

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