CGM and FGM can be used together with an insulin pump to create a closed-loop system. This means that the insulin pump will automatically adjust your insulin doses based on your blood sugar readings. CGM combined with an insulin pump can lower your HbA1c by about 0.5% compared to SMBG combined with multiple daily injections. CGM combined with an automated system can lower your HbA1c by about 0.2% compared to SMBG combined with an insulin pump, but only two studies have tested this so far.