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  • 1.  CGM low alarm

    Posted 14-10-2022 16:20
    I was just wondering at what number do forum members set their CGM low level alarm. I had  mine set at 3.8 by my diabetic educator however was feeling it might be better to catch the low around 4.5. Any suggestions.


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    Michael
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  • 2.  RE: CGM low alarm

    Posted 14-10-2022 19:13
    I have mine set at 4.5 Michael. Better to catch it early on the way down before it becomes a hypo with a glycemic rebound.

    Cheers
    David

    Adjunct Professor David H McKinnon
    School of Education
    Edith Cowan University
    Joondalup 6027, Perth
    Western Australia

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  • 3.  RE: CGM low alarm

    Posted 14-10-2022 20:42
    Thanks David,
    When your CGM is reading 4.5, do you have a typical routine, for example a couple of jelly beans to bring it back to a reading of 6. Do you take into account the arrows on the 4.5 reading and have a different procedure if the arrow  is horizontal, up or down? On my calculations it should take 20 minutes to get to 6. Do you sit around for say 15 minutes until the levels have increased?
    I have always been fairly spot on taking the blood readings however feel that there is still a lot to take in using the CGM, especially with the 20 minute delay.

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    Michael
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  • 4.  RE: CGM low alarm

    Posted 14-10-2022 22:25
    Hi Michael,
    When the warning comes up it is based on the rate of decrease as well as the reading. That gives me 15 minutes to act. I take 4 jelly beans. Clean my teeth! And wait for 10 before doing a blood test. If that is ok, i.e., coming up, I usually wait 30 minutes before doing another and calibrate the sensor if it is not showing up arrows for rate of change.

    Since moving to the 780g pump a month ago, I have only had one of those lows. The algorithm is reasonably aggressive in slowing or stopping the basal adjustments. Quite brilliant in fact. It really knocks off the post prandial highs of 8, 9 or 10 and does that by delivering 0.5 unit micro boluses until the graph stops going up. Very clever.

    Cheers
    David

    Adjunct Professor David H McKinnon
    School of Education
    Edith Cowan University
    Joondalup 6027, Perth
    Western Australia

    ________________________________

    This e-mail is confidential. If you are not the intended recipient you must not disclose or use the information contained within. If you have received it in error please return it to the sender via reply e-mail and delete any record of it from your system. The information contained within is not the opinion of Edith Cowan University in general and the University accepts no liability for the accuracy of the information provided.

    CRICOS Provider No. 00279B
    RTO Code 4756




  • 5.  RE: CGM low alarm

    Posted 15-10-2022 07:13
    I have mine set to 5.3.  This is useful for when I do long (about 6 hours) drives.  I don't necessarily have to take action - that depends on how long since my last bolus, and how much exercise I have been having.

    Geoffrey A

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    Geoffrey
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  • 6.  RE: CGM low alarm

    Posted 15-10-2022 07:22
    Hi Geoffrey,
    It appears that the low glucose levels cannot be changed until fitting a new sensor. I tried to change it last night and it came up up with the message.
    Have you had any success with the Libre 2 changing low glucose levels midway through the sensor?  It also makes sense putting the low glucose levels higher than 5 for driving as it's recommended in Australia by DAFNE.

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    Michael
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  • 7.  RE: CGM low alarm

    Posted 15-10-2022 08:23
    Hi Michael, while I have the app on my phone, I use the reader for alarms.  I can change the settings at any time.

    Regards,

    Geoffrey A





  • 8.  RE: CGM low alarm

    Posted 15-10-2022 09:08
    Thanks Geoffrey,
     I will change the low readings in another week when changing the sensor. It seems to me a health/medical  risk not to be able to change low glucose level calculations when required by the patient. A real limitation of the device!
    I actually rang up Abbott's about the reader and they stated it was either one or the other, the reader or sensor however I was checking out using both in unison when first receiving them under the subsidy. It just doesn't make sense having two bits of related yet isolated technologies. He told me to give the reader to a friend! The Libre 3 might be more advanced and sort out this problem.

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    Michael
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  • 9.  RE: CGM low alarm

    Posted 16-10-2022 10:51
    Hello Michael. Like David mine is also set at 4.5. What frustrates me is the gap that can exist between statial blood sugar readings from the sensor and my BGM readings. So my response is usually to do a blood test at the alert and if confirmed or lower take some jelly beans. However if higher I do nothing and simply monitor the situation. Arrows generally  mean change is happening faster and if necessary I take 5-7 jelly beans and wait 20 minutes before another test to resume whatever it is that I have been doing. Hope that is helpful.
    Cheers Carey

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    Carey
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  • 10.  RE: CGM low alarm

    Posted 16-10-2022 20:22
    I've been gradually increasing the low alarm on my Libre2 from 3.8 initially to 4.3 a few days ago.   This better accounts for the delay in converting my hypo-fix food to a response from my L2.   I use the Android phone app and can change the alarm trigger at any time.  I also have a reader and will frequently cross-check the L2 with a finger prick test and record the BGL in my app's log against the L2 reading.  Its been a useful tool to learn about the time taken for various hypo-fixes to be effective.

    When I spoke to Abbott recently, I was told to take the L2 reading about 5 min following the BGL test (not 10 min).

    I think there is a weakness with the alarm: once the alarm is cancelled by taking an L2 reading, the alarm will not sound again if the readings remain below the alarm trigger.  The L2 alarm won't be functional again until the level rises above the trigger level.  This can be important during sleep time.

    Instead of the arrows (which lack resolution), I would prefer an expanded or auto-ranging vertical scale so that I can make my own judgement about the rate of change.  Its a pity that  we can't use the functions of the phone to expand the size of the graph "image".

    But the L2 is a great help and I really appreciate it.


    I would like the flexibility to also use the reader for the L2, but once a sensor is initiated with the reader, the alarms will only sound from the reader.

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    Jock
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