While diabetes prevention programmes (DPPs) effectively reduce the risk of type 2 diabetes, optimising referral to these programmes is challenging. Our prior research (a qualitative study on the pilot of the National Diabetes Prevention Programme (NDPP) and a systematic review) identified a range of barriers and facilitators to referral from healthcare workers’ perspectives. This study aims to gain consensus on the main factors influencing referral to a newly established NDPP and using the Behaviour Change Wheel (BCW) to select behaviour change techniques (BCTs) for an implementation strategy to improve referral to the programme in the future.

A two-round modified online Delphi survey prioritised 17 barriers and facilitators of the referral process, followed by a mapping exercise with the BCW, which guided the identification of techniques to change referral behaviour from general practice.

The survey took place online with healthcare professionals working in the primary care setting in Ireland (April to June 2024). The NDPP was in the pilot phase and was not available in all areas. This study sought to learn from this pilot phase to inform the referral process, which was not yet fully established.

Healthcare professionals eligible to refer or involved in referral to the NDPP in Ireland (general practitioners, practice nurses and dietitians delivering the NDPP) took part in the Delphi survey. Recruitment was through a number of gatekeepers, a health service manager and professional groups who shared invitations to participate with eligible healthcare professionals.

In the Delphi survey round 1, respondents were asked to rate the importance of 17 factors (nine facilitators and eight barriers) influencing referral on a 5-point Likert scale (not important to very high importance) and an open text box captured other suggested important factors. Barriers included limited practical information about the availability of the programme, concerns about workload, competing priorities and concern about patient motivation, the time commitment for patients and referral delays. Facilitators included electronic referral and feedback, promotion of the programme by healthcare professionals and consultation with patients before referral. Consensus was defined as agreement of ≥70% for each factor in the combined categories of high importance/very high importance, low/moderate importance or not important. Factors not reaching consensus after the first round were included in round 2 with any new factors from round 1. Factors that did not reach consensus or reached consensus as not important or of low/moderate importance were excluded. Only factors reaching consensus as being of high importance/very high importance across the two rounds were included in the final prioritised list.

The Delphi survey had 37 responses to round 1 and 23 (62%) responses to round 2. 12 factors reached consensus as being of high/very high importance to improve referral. The 12 factors are mapped to seven intervention functions in the BCW and to nine key BCTs (feedback on the outcome of the behaviour, social support, instruction on how to perform a behaviour, information about the health consequences, information about social and environmental consequences, demonstration of the behaviour, prompts/cues, credible source and restructuring the physical environment). The strategy to improve referrals should include education delivered by educators to referrers, educational materials on the DPP and practical support to facilitate referrals. The health service should continue to provide electronic referrals and electronic prompts to refer could be considered as part of the electronic health record.

This study systematically prioritises factors perceived to influence referral and identifies BCTs to improve referral to an NDPP. The BCTs are a starting point for a strategy to improve referral to DPPs. Further consultation with stakeholders is recommended to discuss the acceptability, feasibility and operationalisation of the BCTs in the Irish setting.