This study has now closed to recruitment. Thankyou to the 41 Bay Medical Group patients who are taking part. We will publish the findings of the study here when they are published. 

Background and Study Aims

The DEFINE study will help health care professionals in GP surgeries provide a more personalised approach to managing patients’ asthma by using FeNO to guide decisions about their treatment.

Around 5.4 million people in the UK receive treatment for asthma. However, although more and more asthma medications are being prescribed each year, numbers of serious asthma attacks are not going down.

To help prevent serious asthma attacks, we need to make sure the right treatments are given to the right people in the right amounts.

Learn more about the study on the Oxford University DEFINE website