Table 1.

Advantages and disadvantages for DIY APS as compared to conventional sensor-augmented pump therapy

Advantages	Disadvantages
Reduced hypoglycaemic episodes, frequency and duration	Unregulated and not medically approved
Reduced glycaemic variability	Requires user engagement and activation
Improved overnight glucose profile	Requires investment of time to understand and set up systems
Reduced psychological burden and regimen burden	Requires a small additional financial investment
Improved time in range from automated insulin delivery	Technical support not available from HCP, clinics or device manufacturers although available via DIY community
Improved quality of life	Technical proficiency needed although can be acquired and learnt via DIY community support
Helps adapt to changes in physiology	Depending on algorithm used, compatible with certain but not all pumps and CGM Models of pumps that can be used for ‘looping’ are continuously being expanded
Improved flexibility and customisation e.g. control and connectivity to wearable devices	Increased battery usage of smartphone and pump
Responsive DIY community support available
Algorithms and software continuously being updated and improved
Can overcome modest errors or miscalculations in carb entries and bolus calculations
Allows remote monitoring (e.g. via Nightscout) for carers