I was diagnosed with type 2 diabetes in 2014 and give a device for checking blood sugar levels. Nobody has ever explained what reading are high/low in my case high. My reading is over the last few months has been between 14 and 20 mmol/L - today’s reading 20.1 mmol/L. Not sure if I should be concerned as this is a significant increase on what my levels have been in previous years (around 8mmol/L). Thanks, Jon