Replies to This Discussion

Permalink Reply by lisa c on April 9, 2011 at 3:21pm

Sometimes it just keeps doing it. Very fristrating for sure. Make sure the sensor is on same side of body as transmitter, wait 1-2 hours and it will remedy itself. After 3-4 times in a day...I just restart or rip it out.

Permalink Reply by Korrie on April 9, 2011 at 9:29pm

How stable are your sugars? Do they change rapidly? That is one of the big reasons I have found that the Dex will ??? you, especially as the sensor gets "older."

Permalink Reply by Andrew Tumsuden on April 9, 2011 at 9:35pm

not that rapidly

Permalink Reply by Jay on April 10, 2011 at 8:46pm

Keep in mind the way the Dexcom unit works. The wire and its covering generate a small flow of electrons - current. The transmitter reports the current. The receiver takes the electrical current value from the transmitter and calculates the equivalent BG. If the value the receiver comes up with is out of range, then the ??? is displayed.

I "treat" the ??? by placing the receiver directly on the transmitter - shortest distance = best reception. Wait 10 minutes and check the receiver. If a number is shown, I do a single finger stick, enter it and life is good. If the ??? is still showing, it is usually a bad sensor. If the sensor has been in less than 7 days, I call Dexcom for a replacement. If greater than 7 days, change the sensor and be thankful I got more than 168 hours out of the sensor.