CGM and diving

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I use a Libre 2 for fitness. I only dive dry, but have brought my cgm down to about 200ft with no issue from pressure
 
I use a Libre 2 for fitness. I only dive dry, but have brought my cgm down to about 200ft with no issue from pressure
May I ask how you determined that the pressure didn't cause issues with your device?

Best regards,
DDM
 
May I ask how you determined that the pressure didn't cause issues with your device?

Best regards,
DDM
It continued to work after the dive another 10 days(when it was supposed to be removed) and my readings were as steady as they were from the cgm before and after it. I track it in a second party app
 
It continued to work after the dive another 10 days(when it was supposed to be removed) and my readings were as steady as they were from the cgm before and after it. I track it in a second party app
Did you double-check it against a traditional glucometer?

Best regards,
DDM
 
Came across this gem, although not extensive enough, very interesting conclusion. I am a g7 user and so far haven't had any issues but I keep my dives pretty shallow.

 
Did you double-check it against a traditional glucometer?

Best regards,
DDM
We make CGM systems (I was Chief Scientist when MiniMed got the first CGM approved by FDA). We routinely test them to the equivalent of 100 ft salt water to make sure there were no issues. The only issue might be if you were diving dry and you used nitrox to fill your suit. You might see a very small increase in glucose compared to 21% O2 since the enzyme everyone uses has oxygen as a reactant. But the effect will be pretty small maybe a 2% increase in estimated glucose.
Bill
 
We make CGM systems (I was Chief Scientist when MiniMed got the first CGM approved by FDA). We routinely test them to the equivalent of 100 ft salt water to make sure there were no issues. The only issue might be if you were diving dry and you used nitrox to fill your suit. You might see a very small increase in glucose compared to 21% O2 since the enzyme everyone uses has oxygen as a reactant. But the effect will be pretty small maybe a 2% increase in estimated glucose.
Bill
Thanks for the firsthand perspective! What are your thoughts on using the device you worked with deeper than 100 fsw? When you test the devices, is it in a wet or dry environment? If wet, how do you determine that the tape/seal remains intact?

Best regards,
DDM
 
Did you double-check it against a traditional glucometer?

Best regards,
DDM
Not after diving, no. But I have randomly spot checked blood vs the cgm many times and they’ve been very similar. My blood glucose is pretty steady other than when I have cheat meals. The cgms that have been dove all fall within the same glucose range as ones that haven’t been dove. And I know my average cgm glucose is very similar to my spot checks.
 
Not after diving, no. But I have randomly spot checked blood vs the cgm many times and they’ve been very similar. My blood glucose is pretty steady other than when I have cheat meals. The cgms that have been dove all fall within the same glucose range as ones that haven’t been dove. And I know my average cgm glucose is very similar to my spot checks.
You might consider double-checking your CGM readings after diving, especially if diving beyond your device's tested limits.

Best regards,
DDM
 
Thanks for the firsthand perspective! What are your thoughts on using the device you worked with deeper than 100 fsw? When you test the devices, is it in a wet or dry environment? If wet, how do you determine that the tape/seal remains intact?

Best regards,
DDM
I am pretty sure that deeper will not be an issue but will check next week. The transmitter case is sealed and we test both wet and dry although FDA will not allow us to talk about anything other than 8 feet for 24 hours or equivalent. If the seal breaks you will know pretty soon that water got in, all kinds of alarms will be evident. To test seals we put the device in a classic water pressure rig. We haven't broken any at 100 feet but I will see how high my lab guys will let me run it next week.

Bill
 
https://www.shearwater.com/products/swift/

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