Anyone else get wildly inaccurate Dexcom readings?

IanA123 said:

Freestyle libre is hopeless, alerted me to being low and a scan showed 3.3, finger prick showed 12.4. Repeated finger prick and got same result 5mins later. Freestyle showed 2.9. Consultant did state finger prick is gospel amd they are aware of the inaccuracies of the cgm devices.

Click to expand...

I use FS2 my readings when compared to a finger prick test are generally accurate whilst I am stable but if I am dropping down they can be as much as 2 points out. That is if my FS2 reading is 4.5 my finger prick reading could be as low as 2.5. This becomes apparent when I start getting hypo symptoms and is the reason I double check. I tend to set the alarm at 5 when driving but of at night I set it at 3.8. I very occasionally trigger the alarm at night and keep a few biscuits handy. No matter how low I am going to bed I am always high in the morning so don’t worry so much.

Update, I asked for a switch to Tresiba and this has worked out better for me. I take 34 units at night and this gives me a stable bs overnight and in the morning as long as I don’t eat anything! This could help me cut down on food and lose a bit of weight.

Garak said:

Hi all,

I’ve been using Dexcom One sensors for a few months now. My readings are mostly 30-50% out compared with blood glucose readings. However, I’ve read they’re meant to be within 15% of a finger prick result. I’ve tried locating them on the back of my arms and on the sides of my abdomen, but nowhere seems to give reliable readings, not even in the middle of the sensor period. There seems to be little point in the NHS funding these in my opinion, or is this just me? Interested in knowing what other people’s experiences with these are? Thanks

Click to expand...

I actually stopped using mine altogether as I wasn't getting alerts and getting hypos, couldn't trust it as I drive most days so back to finger pricks,at I know what's what