Cgm is it reliable and accurate

[Emjay]

I’m doing Newcastle vlcd to improve my type 2 diabetes. I’m using a dexcom one plus cgm to keep an eye on blood sugar levels. Tonight it is constantly saying I’m hypo 2.5-3.6 but I feel fine and finger testing says 7.1. Does this happen a lot with cgm where it’s complely wrong? Should I use a different one? Can I believe any of the last two weeks reading?

 

[EllieM]

Have you just put the sensor on @Emjay ? New sensors sometimes read low for the first 24 hours because your skin is reacting to the insertion. If it's still off after 24 hours dexcom should replace it.

 

[grantg]

the first couple libre sensors i've had appeared to be pretty accurate within 0.5 either side of finger pricks. the latest one way off (by upto 8mmol). I contacted Abbots (Libre 2+sensor) who have used DHL to send out a replacement (that was on friday was told 48-72 hours still waiting lol) sods law I have dr's appt later this afternoon, i'm betting that they turn up either during school run or whilst im at the dr's. Abbots mentioned sometimes can be caused by lack of 'fatty tissue' in the area that attached alongside stating it could possibily be a faulty sensor. phone call to them was under 15 minutes having to read some stuff out to them from the about menu's. Customer service seemed good. You should of been informed when you got the cgm to ensure to finger prick check if results are 'off' or sympthons dont match results.

There can also be some other issues, such as compression which can appear to have an effect on values. Staying hypdrated apparently helps.