Tip 136: CLD

Chronic lung disease (CLD) is sometimes known by its histological finding – bronchopulmonary dysplasia (BPD).

There are a variety of definitions, but the most commonly accepted is:

Treatment with O2 for ≥ 28 days AND still in O2 at ≥ 36/40 CGA.

However, the references below describe “mild CLD” as treatment with O2 for ≥ 28 days and in air at ≥ 36/40 CGA.


Kinsella JP, Greenough A, Abman SH. ‘Bronchopulmonary dysplasia.’ Lancet 2006; 367: 1421-31. 

Adams JM, Stark AR. ‘Pathogenesis and clinical features of bronchopulmonary dysplasia.’ Aug 2013. UpToDate. Accessed on 27th June 2014.

First published: 07/07/14

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