Lung function investigations

Lung function investigations are an integral part of the respiratory medicine service at the Whittington Hospital. The service also investigates sleep-related breathing disorders.

Lung function investigations are painless breathing tests designed to measure the capacity of the lungs and how efficiently they are working.  The tests take between 20 minutes and one hour to complete. You be told what you can and canít do prior to and during the tests when you receive your appointment.


All patients referred for sleep investigation are seen by a respiratory physician prior to having a sleep study. Patients may be referred from a wide variety of sources including GPs, weight management services and the hospitalís ENT, surgery, haematology, rheumatology or neurology departments. Patients are asked to complete a questionnaire of daytime sleepiness before their first appointment. Patients with obstructive sleep apnoea (OSA) are treated with continuous positive airway pressure devices (CPAP) and are followed-up through the respiratory laboratory on an annual or Ďas neededí basis.  The service provides a helpline for patients on CPAP treatment.

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