@Dave44 - The new G5 transmitters have backfill capability up to a maximum of 3 hrs into the past. Sometimes referred to as the G5 v1.2 transmitter.
I really love this feature.
There should no longer be any Dexcom G5 Transmitters being shipped (from either Dexcom direct or a distributor) that do NOT have this feature. There is no special marking on the Transmitter box but it can be identified based on the serial number (actually Transmitter ID). And it is obvious when it works.
The newer Dex App on a Smart Device supports this functionality on the receiving end. I don’t know exactly when the app started supported this but if you just go with the current version then you know it has the support.
The Tandem t:slim X2 with the G5 update also supports the backfill capability.
The Dexcom Receivers available still do not support this, even the ones currently being shipped out direct from Dexcom.
I have not heard specifically if the newer (not yet available) Dexcom Touchscreen Receiver will have this backfill capability. I would be pretty surprised if it did NOT have it. Dexcom CEO (August 1, 2017 - Q2 Earnings Call) speaking about Medicare recipients and the new Dexcom Touchscreen Receiver:
“For Medicare right now, since we have the receiver, we continue to sell it and have it part of the system. We have a new receiver we’re launching here in the fall that will be here for the patients.”
(ie - “new receiver” would be the Touchscreen Receiver that has not yet been made available)