Back in August I wrote about how wearing a constant glucose meter (CGM) is a game changer in helping me manage my diabetes. I still believe that a CGM should be standard issue when someone receives a diabetes diagnosis but in this post I want to talk about one downside that I have experienced over the last several months. While the commercials for CGMs talk about getting away from finger sticks, in my experience it is prudent to keep the old lancet and standard glucose meter nearby.
Recently, after attaching a new CGM, I began to get numbers that did not make any sense. I woke up the next morning to an unusually high reading and just couldn’t seem to get the number back down. Over the next 48 hours I did what I would usually do when my readings are high but nothing seemed to work. And then it hit me. I needed to get my old meter out to verify what the CGM was telling me. After a quick finger prick, I had my reading and it was significantly lower than what I was seeing on my CGM. Fortunately the Dexcom G7 that I wear has a function that allows for recalibration and within 5 minutes my CGM was back into agreement with my old fashion glucose meter.
The instructions for the Dexcom G7 warn that during the first 24 hours after inserting a new unit, there might be some readings that are off and on their website Dexcom advises taking a finger stick reading any time that the CGM readings don’t make sense or don’t match what you are feeling. While most of the time my CGMs are on target, there are times when I need to recalibrate. So while I wish I could get rid of my old lancet, I still need it and am thankful for the ability to verify the information that I use in managing my glucose levels.
Maybe one day we will have a CGM that does not need any recalibration or any other kind of back up reading. But for now, if you are thinking about getting a CGM, remember that you need to keep your old lancet and glucose meter, and yes you will still need to do the occasional finger stick. That being said, a good constant glucose meter is still the way to go when managing diabetes.
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