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Libre 2 sensor and testing
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<blockquote data-quote="Antje77" data-source="post: 2679990" data-attributes="member: 372207"><p>For me, Libre reads pretty consistently lower than blood by about 1-2 mmol/l.</p><p>I use the unofficial app DiaBox (only on Android, not in the play store) next to the official app. DiaBox can be calibrated, and has more useful alarms to my thinking. Still not perfect though!</p><p></p><p>Depends. </p><p>New sensor? Often, say 3 to 5 times because I don't trust it and need to calibrate.</p><p>Proven sensor? I occasionally have a day without fingerpricking but on most days I test 1 or 2 times.</p><p></p><p>I test more often around exercising because my BG can change quicker than my Libre notices, but less often than when I started exercising, I have developed a bit of a feeling on what to expect. </p><p></p><p>I always test after a hypo. I think the back of my arm is very low on my body's list of priority when it comes to where to send the glucose first. It can take close to 30 minutes after getting a >4 fingerprick for my Libre to notice the problem has been long solved.</p><p></p><p>I test multiple times after swimming (or dipping) outside, which I do at least twice a week. The water temperature has gone back up to a balmy 7.8 °C as of today, but the Libre stops working below 10 °C (gives a 'sensor is too cold' error message until it's warmed up again). And those cold swims have some spectacular effects on my numbers. On top of that, either the cold makes it confused for at least 40 minutes after, or the cold does interesting things to the amount of glucose in the back of my arm. Either way, sensor BG doesn't add up with a fingerprick at all during this time, and I choose to trust fingerprick more. Would be interesting to know what venous blood does around swimming, might be completely different yet, but no way to find out.</p><p></p><p>Mind, none of the things I do come anywhere close to what is official advice, but you asked what we do, and from your posts it looks like you want to know everything and dive head first into this diabetes thing, so here you go. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite44" alt=":joyful:" title="Joyful :joyful:" loading="lazy" data-shortname=":joyful:" /> </p><p></p><p>I've never tested for ketones in the 7 years I've had diabetes.</p><p>There are only two scenarios in which I would want to test: High BG well into the teens that won't drop, and illness with symptoms that may be caused by DKA.</p><p>Neither have happened so far, and if they do I'll curse myself for not having a means to test for ketones. </p><p></p><p>Looks like you've hit the ground running, keep doing what you do but make sure you don't burn yourself out.</p><p>As long as it feels right, by all means, keep learning as much as you can!</p><p>But if it leads to feeling like it's all too much, by all means give yourself a break, don't expect to be perfect from the start, and allow yourself to slow down.</p><p>This is a marathon, not a sprint.</p></blockquote><p></p>
[QUOTE="Antje77, post: 2679990, member: 372207"] For me, Libre reads pretty consistently lower than blood by about 1-2 mmol/l. I use the unofficial app DiaBox (only on Android, not in the play store) next to the official app. DiaBox can be calibrated, and has more useful alarms to my thinking. Still not perfect though! Depends. New sensor? Often, say 3 to 5 times because I don't trust it and need to calibrate. Proven sensor? I occasionally have a day without fingerpricking but on most days I test 1 or 2 times. I test more often around exercising because my BG can change quicker than my Libre notices, but less often than when I started exercising, I have developed a bit of a feeling on what to expect. I always test after a hypo. I think the back of my arm is very low on my body's list of priority when it comes to where to send the glucose first. It can take close to 30 minutes after getting a >4 fingerprick for my Libre to notice the problem has been long solved. I test multiple times after swimming (or dipping) outside, which I do at least twice a week. The water temperature has gone back up to a balmy 7.8 °C as of today, but the Libre stops working below 10 °C (gives a 'sensor is too cold' error message until it's warmed up again). And those cold swims have some spectacular effects on my numbers. On top of that, either the cold makes it confused for at least 40 minutes after, or the cold does interesting things to the amount of glucose in the back of my arm. Either way, sensor BG doesn't add up with a fingerprick at all during this time, and I choose to trust fingerprick more. Would be interesting to know what venous blood does around swimming, might be completely different yet, but no way to find out. Mind, none of the things I do come anywhere close to what is official advice, but you asked what we do, and from your posts it looks like you want to know everything and dive head first into this diabetes thing, so here you go. :joyful: I've never tested for ketones in the 7 years I've had diabetes. There are only two scenarios in which I would want to test: High BG well into the teens that won't drop, and illness with symptoms that may be caused by DKA. Neither have happened so far, and if they do I'll curse myself for not having a means to test for ketones. Looks like you've hit the ground running, keep doing what you do but make sure you don't burn yourself out. As long as it feels right, by all means, keep learning as much as you can! But if it leads to feeling like it's all too much, by all means give yourself a break, don't expect to be perfect from the start, and allow yourself to slow down. This is a marathon, not a sprint. [/QUOTE]
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