I've been using the dex for a few months. The first couple of times I would actually take two separate bg readings and enter them. Now I just take one and enter it twice. Seems like the dex's accuracy is the same no matter which I do.

Also when I first got the dex the trainer suggested that people don't test twice. So I don't feel too bad about not doing it. What are other people doing?

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yes, yes! :) And use different finger. I also do each hand to make sure I get a balanced reading!
per the training i got, i always test once and enter it in twice.
The training I got from my CDE, who is also has diabetes said always use two different fingers, because you will get two different readings which is better for sensor accuracy. This morning mine was 100 and 104. However, I can't find anything in the book that gives clear recommendation for the separate fingers, but my diabetes team (doc and CDE) said use different fingers.
the person who trained you should be chewed up!!! paulG and others are very right on this... you should call the trainer to stop "training" peeps this way.
My son uses both hands - and does two readings.
HI. I always test twice (one poke, two strips).and enter both readings.
I would tend to agree that as long as the BG number you enter is representative of BG, it should not affect the accuracy.
Would you be doing so only to save on one strip?
Timing of your post is funny because for the first time ever today both of my start up readings were the exact same number (181--two hours after breakfast).
I've always wondered about the need to enter two readings, and my view is that by entering two readings in a row we're just "telling" the Dexcom to disregard the previous calibration history and start with a new profile due to a new (or not-so-new) sensor.

Infact, sometimes I enter the BG reding twice even in normal operations, particularly so when what I read on the Dexcom is very different from my BG reading.

I've never pricked my finger twice, and used two strips to read BG in order to do the initial calibration. No need to waste consumables, and the fingerstick reading have errors too!

Ciao, Luca
I test twice, once from each hand. Surprised by how much the two numbers can vary, but I suppose that has more to do with meter accuracy than with the actual glucose levels I have. Still - seems like a good practice. Usually takes a good 18 to 32 hours of calibration negotiations between my Dexcom and me before things start reading the same.
Most of the time, I do two tests - because if I don't, it will be one of those times where my test was off because the alcohol on my finger wasn't dry enough, etc., and then I've calibrated the CGM wrong.
I decided to look up calibrate:
cal·i·brate
1 : to ascertain the caliber of (as a thermometer tube)
2 : to determine, rectify, or mark the graduations of (as a thermometer tube)
3 : to standardize (as a measuring instrument) by determining the deviation from a standard so as to ascertain the proper correction factors
4 : to adjust precisely for a particular function
5 : to measure precisely; especially : to measure against a standard

courtesy of merriam-webster.com
one CAREFUL test, entered twice.

But in contrast, I feel that waiting an entire 12 hours before re-calibration is a mistake. (On a new Sensor; not the 2nd or 3rd week of an old one.) Things change a lot during those first few hours, so I try to do some extra ones.
I like to do it twice on separate fingers just to be sure the first wasn't the result of lotion or sugar being on the first finger thus messing up the initial accuracy.

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