Only little information exists about the long term consequences of having severe lung disease in childhood. The patient population is heterogenous and the prognostic markers are few.

This observational study will investigate which parameters that can be used to predict the outcome of having severe lung disease in childhood.

All patients aged 0-18 years at the HCA Childrens Hospital with a severe lung disease will prospectively be registered in a database.

At a yearly follow up, data from the patient record will be registered. Informed consent from the patients and/or their parents will be obtained. Registered data will include height, weight, results of lung function tests and imaging diagnostics.

The study will provide knowledge of the prognosis of different lung diseases and how to monitor lung function in children.

Inclusion Criteria: severe lung disease -

Exclusion Criteria: no informed consent

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Patients with severe chronic lung desease