Wednesday, 19 August 2015

Dexcom G4 sensor 1 lasted for 30 days!

I had a sensor stuck in my arm for 30 days!!! It was time to remove my first Dexcom G4 sensor. I could probably have used it for a couple of more days, but I started to get more and more noise from the sensor. In the image on the right you can see the graph did not look very smooth any more. The low glucose alarm falsely woke me up a couple of night, because of random noisy low values. It lasted 30 days!! I'm extremely happy with the results. I would have been happy if it lasted only 14 days. The sensor stayed stuck nicely the first 7 days, only then did I add tegaderm over it. After 14 days I added another piece of tegaderm. The sensor seemed a bit loose on day 21, but it was still functioning well. I placed a sock over it for the last 7 days, which helped a lot to keep it in tack and it looked much neater. My Dexcom reader is also not used any more, I don't carry it around and rarely looked at it. The xDrip application is just working so much better than the reader. I'm wearing the sensor at the back of my upper arm. It was easy to limit the amount of water getting to the sensor. The only downside I had with wearing it on my arm was that I experienced a few compression lows during the night. A compression low is when the sensor is pushed against the body and it reports a false low glucose value. Typically this sometimes happen when you sleep on top of the sensor.

My current sensor configuration can be seen in the image. I'm covering the white part of the sensor sticky tape with a tegaderm that contains a hole such that the transmitter fits in the hole. I also added another larger tegaderm over the sensor and transmitter. The nice thing about tegaderm is that you can hardly see it and it does a good job in holding things down with the additional benefit of being waterproof. The black thing around my arm is a sock cut open. I keep my xDrip bridge device inside this sock. The transmitter reads the glucose levels from the sensor. The xDrip bridge collected the signals transmitted by the transmitter and sends the data to my cellphone via bluetooth. My xDrip bridge also buffers 40 minutes worth of data, so I don't always need to be near my cellphone. Obviously I take off my xDrip bridge when I shower or sleep, but the sensor and transmitter stays in all the time.

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