Futility analysis showed that the probability to validate out hypothesis was near from 15%

The objective of this multicentre prospective study is to validate CAPTURE as a French case finding tool for undiagnosed patients suffering from obstructive pulmonary disease.

A large number of healthcare professional across the country will screen participants.

Participants willing to participate will have a short interview, and then will have to answer the 5-item CAPTURE questionnaire. They will be assisted to perform a peak expiratory flow measurement with a portable device. The comparison will be made between the CAPTURE decision and a portable spirometry assessing the presence or not of an obstructive disorder.

Patient screened either by the tool or the spirometry will be addressed to a doctor. Follow-up at 6 months will be set up in order to assess the entry or not of those patients to an approved health care pathway.

At the end of each center's participation, a questionnaire will be sent to all healthcare professionals working on the study, to assess the ease of use of spirometry and the CAPTURE tool and its possible implementation in clinical practice.

Inclusion Criteria:

• People aged 40 or more,
• Provision of dated and signed informed consent form,
• Currently being treated by a healthcare professional,
• Patients affiliated to the french social security system.

Exclusion Criteria:

• Patients previously diagnosed with COPD or asthma,
• Patients with any condition making them unable to perform spirometry or answer a short questionnaire,
• Patients unable to give free and informed consent.

Adult men and women over 40 years old will be recruited from a broad range of healthcare professional in primary care across the country. Any patient attending an appointment will be screened for inclusion.