This is normally something I'd post as a blog, but I thought I'd do it in the forums so that people can lend thoughts and experiences. For those who don't know, I'm doing a Dexcom trial to decide if I want to buy one with my own money. I'll say up front that if my trial sensor lasts for two weeks there is no doubt that I'll be purchasing a Dexcom. :)
Here is my first 24 hours, which is actually not as bad as I thought it would be:
I seem to be having GREAT accuracy with the Dexcom. It is almost always within the same mmol/L as my reading, even if the decial point is different. And I've even had some match exactly:
In this first 24 hours I've also noticed some interesting things. I ate *exactly* the same breakfast and lunch yesterday and today (weighed and measured), and had the same routine both days, and got completely different results. (And since I know people will ask, no, it wasn't a low-carb lunch. I also pre-bolus by 30 minutes when I eat.) I plan on eating the same thing tomorrow (I'm also eating the same dinner each day) to see what happens, then after that I'll start experimenting with other meals.
Also, I've written before about how I think I spike in the morning from zero-carb breakfasts. But after last night, I think it might just be a rise that starts at 3-4am and continues until after 9am. This morning I ate a zero-carb breakfast and it didn't seem to change anything, eventually at 9am I was 10.5 or so and did a correction (I also did a correction yesterday after breakfast, before I'd started the Dexcom, so I don't think that contributed to my lunch thing...).
This afternoon I went low and I felt a lot lower than 3.8 (which the Dexcom said I was) and my meter said I was 3.1, so I had a glucose tablet. About 15 minutes later I was still 3.7 so had two more. Then another 15-20 minutes later my blood sugar suddenly shot up really fast:
Never would have thought 12g of carbs would make me go from 3.8 to 9.2! If that's indicative of how much carbs raise me (since there was no IOB at the time and I was not dropping fast) then a gram of carb equals 0.45 mmol/L or 8 mg/dl. However, last night I went low and I corrected with 20g of carbs, which I was sure would be too much but seemed to work perfectly...
Also, it seems like food and insulin both take forever to show up on the Dexcom, sometimes over an hour after eating before my blood sugar does anything.
Out of curiosity, how often do people see double up and down arrows? I was talking to a friend with Type 1 who says she rarely ever sees them. I've seen double up/down at least 5-6 times in the 1.5 days I've had the Dexcom...
Anyway, I am still only 36 hours into this experience. The rep said I can keep the receiver and transmitter until the sensor falls off - here's hoping that's at least two weeks! So far my sensor feels a bit pokey/sore but the readings seem very accurate and I think this could be a really, really useful tool for me!
(P.S. Sorry, not sure why some of the photos are upside down - they're linked to my Dropbox and the photos there aren't upside down, so not sure how to fix it...)