The glucose level in the interstitial fluid is 10-20 minutes behind the BG
calibration matches the interstitial fluid glucose to BG, but does not remove the delay
the Dexcom shows a number that is 15 minutes behind the real BG.
I was going to post in that sense, but I actually reviewed some scientific literature, and, as of 2014, the papers are saying that the Dexcom number is estimating the BG right now (not 15 minutes behind).
I am not 100% sure what is reality today. I need to do more research
I had always assumed that was true (and somewhat verified by experience) until you asked
I am pretty sure that xDrip reports the BG 15 minutes ago, as estimated from the interstitial fluid. But confirmation should come from the experts: @docslotnick, @dm61, what do you think?
Not exactly sure about the xDrip algorithm, but I rarely if ever get a fifteen minute (or five minute) lag when crashing and recovering. The readings stay pretty consistent with fingersticks going into and coming out of a low.
I’ve never really understood how they do it. This morning I was 55, and I quickly brought it up to 87 (within 10 minutes), but the CGM was still showing me in the very low 60’s after 56 minutes (with a horizontal arrow).
I don’t get it. After 56 minutes it still hasn’t caught up, and shows no inclination of catching up.
I asked tech that before they said it’s when the sensor gets blocked similar to when it eventually breaks after wearing a lot - the fluid gets stuck in the sensor with the same reading and stays flat even though it’s actually changing
Same thing effects when you see a flat like and then it jumps to another flat line - sensor is getting clogged and unclogged not sure if he was makkng it up but he said to massage the fat around and it might loosen the block
I’ve actually wondered about this… in my years on the doc it seems that I’ve observed on general that people with very lean body types report far less stellar cgm performance than those with maybe just a little tiny bit more body fat… I don’t even mean fat people either there seems to be a discrepancy between normal and extra lean people in my observation… not exactly a scientific experiment but I wonder if guys like me and Eric just aren’t juicy enough to keep the dexcom working right