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The Reid Index is a mathematical relationship that exists in a human bronchus section observed under the microscope. It is defined as ratio between the thickness of the mucosa secreting glands and the thickness between the epithelium and cartilage that covers the bronchi. It isn't of diagnostic use in vivo since it requires a dissection of the airway tube, but it has value in post mortem evaluations and for research.
Additional recommended knowledge
A normal Reid Index should be smaller than 0.4, the thickness of the wall always more than double the thickness of the glands it contains. Hyperplasia and hypertrophy of mucous glands as in chronic bronchitis causes them to be present at deeper levels in the bronchial wall and thicker in size, thus increasing the Reid Index beyond the normal value.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Reid_index". A list of authors is available in Wikipedia.|