I can't recommend a CGM as I have not found one I find accurate.
However, I would suggest you work out what are your criteria.
- Do you have a budget? Libre is the cheapest.
- Do you want to replace most of your finger pricks or to work out trends? None are recommended in the UK for bolusing from and, if you drive in the UK, you must test with a finger prick.
- Do you want to wear it all of the time? This affects your budget but is also based on why you want to have one.
- Are you concerned about where you wear it and what it looks like? The Libre is only licensed to wear on the arm. Dexcom on your belly. Libre is smaller. Dexcom is bulkier.
- Do you want it to alert when your BG is out of range or just to check your BG without finger pricking? Libre does not alert (unless you "pimp" your Libre)
- Do you trust "factory calibration"? Libre is factory calibrated and there is no option to calibrate it to you. Dexcom must be calibrated with finger pricks twice a day.
- Do you have a chance to trial them? I would definitely recommend this. No matter what reviews and opinions you read, every one is different and only you will know what suits you.
I have trialled both Libre and Dexcom and got very frustrated with them being out by a long way: the Dexcom would alert to tell me I was low at night and wake me. This is great. Except my finger prick reading was 6.4.
Over time, I realised the best value for me is to use them to spot trends such as how long after eating pasta does my BG start to rise (so I can bolus earlier).
But others swear by the Libre (which I found the most unreliable for me) and would not be without it.
