I have needed a few CT scans recently and have been really tired of popping out my transmitter each time (playing by Dexcom rules), popping it back in after CT scan and then wait for 45 minutes to 2 hours for the transmitter and receiver to sync back in. Today is 12/22/2020 and my 10-day sensor will expire on 12/25/2020 at which time will be the 100+ day end of life for my transmitter as well.
I decided with only 3 days to go before I need to put in both a new G6 sensor and a new transmitter that I would experiment wearing them during my CT scan and see if the Siemens dual source scanner, bombarding my sensor and transmitter with x-rays in any way disrupts, destroys or distorts the signal or information sent to my Dexcom receiver. I normally have also asked for the receiver to be taken out of the room and kept in the control room during this procedure. This time I kept the receiver in the room, next to, although not inside the scanner.
The CT Scan had absolutely no effect on either my sensor, transmitter or receiver. BG readings did not even skip 1 dot and stayed normal flatline during the procedure. So, from now on I always plan to just leave my CGM in place and not mess with it in any way when having a CT Scan.
CT scans are becoming increasingly ubiquitous so it would be nice to see others that have had experiences with their CGM and computed tomography to chime in.
Please note if you attempt to do this you are not abiding by Dexcom’s written procedures so you do so at your own risk. Dexcom statement is as follows:
No MRI/CT/Diathermy – MR Unsafe
Don’t wear your CGM (sensor, transmitter, receiver, or smart device) for magnetic resonance imaging (MRI), computed tomography (CT) scan, or high-frequency electrical heat (diathermy) treatment.
The G6 hasn’t been tested in those situations. The magnetic fields and heat could damage the components of the G6, which may cause it to display inaccurate G6 sensor glucose readings (G6 readings) or may prevent alerts. Without G6 readings or alarm/alert notifications, you might miss a severe low or high glucose event.