Results! - The G5-G6 Challenge - An actual comparison

[jbowler]

@BillKast

Come back to the screens a few minutes later and Dex graph looks very pretty. Loop graph is noisy.

Yes. For a graphical picture of what is happening see this post:

Resistant low - puzzling?

For me that delay is about 5 minutes, I’m using the Dexcom G6. If I do a fingerstick in the intervening period I seem to get a lower result, but not as low as my bg eventually goes, so I think the fingerstick is delayed by maybe 2-3 minutes from the level in the blood going to my brain. For me vision disturbance happens somewhere in the range 30-40mg/dl, certainly under 50. I’ll let a sub-80 figure hover without immediate treatment if the CGM shows a flat line and I’m at home with my wife, …

I superimposed recorded values from SugarMate over the 3-hour delayed values reported to Apple Health from the Dexcom app. The adjustment is consistent with your two sets of numbers [I editted the stuff below to align the numbers and remove the spurious double space in @BillKast’s original post.
I also added emphasis in italics.]:

@BillKast

142, 139, 135, 135, 131, 132,142
142, 139, 136, 135, 134, 132,138

What I don’t know yet is whether the adjustment happens in the transmitter or the receiver. Logically it would be the receiver; Dexcom delays an update to Apple Health for three hours, presumably so that it can let that adjustment pan out. The transmitter retains 3 hours of readings, so if you are about to rewrite history probably better not do it for three hours.