I currently use a Dexcom Platinum G4 transmitter due to it great battery life as opposed to the G5 which I have stopped using as it only lasts 3 months.
I need to purchase a receiver for the G4 - (but before I purchase), I would like to know if anyone knows if I can use a Dexcom G5 receiver with the Dexcom G4 transmitter?
The only component common to both the G4 and G5 systems is the sensor. The G4+Share receiver may be reprogrammed to convert it into a G5 receiver, but then that receiver could only be used going forward with a G5 transmitter.
To answer your question, a G5 receiver cannot work with a G4 transmitter.