2/20 Tommy AMPS 195 (big drop.) Freestyle Libre2 expiring in a few hrs- bad data?

Cozy Biscuits

Cozy Biscuits

Member Since 2023
Hello everyone :cat:

My Freestyle Libre 2 is expiring in 5 hours so I'm assuming I'm getting incorrect values as a result based on the concurrent Relion measurement I just did. I reviewed the Libre2 downloaded data and it matches with our Libre2 scanned value... see comparison below.

Tommy ate ~1 oz of wet Glycobalance around 3:30pm (+3 3h15m). Usually we mix 2:1, Glyco + FF, but I gave him straight Glyco because I was panicking and it has a lot of carbs.
Note: I'm slowly getting him off Glycobalance and strictly on FF over the next week or two.

I just tested concurrently, my Relion Premier Classic gave me a reading of 109 vs the Libre 2 reading of 61. I should have done this a couple of hours ago to compare/track values but... hindsight 20/20.

I'm going to resume testing every 15m with the Relion until he's past the nadir point (insulin seems to peak around +5.)

Right before testing with Relion, I panicked and gave Tom about 10 Temptations. We have FF Gravy Lovers and Karo syrup as well as Temptations in case he continues to dip below 60, based on the Relion readings from this point on I guess.

Here's what the Libre 2 has been showing over the past few hours. I apologize if my syntax is incorrect regarding tests in between hours:

AMPS 195
+1 146
+1.5 (1h30m) 107
+2 106
+2.5 95
+3 69
+3.5 100 (Ate 1 oz Glycobalance wet)
+4 60
(4h 10m post injection, measured w/ Relion and Libre. Relion- 109 vs Libre- 61 :banghead: )


Is the Freestyle Libre 2 known to act like this right before it expires? The alarm gave me a heart attack and I am glad I checked the Relion but I am prepared to act.

I tried to call/text vet but it's a holiday. Please help me cat lovers- how should I dose Tommy tonight? I give him insulin at midnight. This is our first scare and I'm worried about giving him meds without being able to monitor him constantly overnight.

I will update this thread every so often to track his progress. THANK YOU all!
 
I have seen reports of the Libre going wonky before it dies. Also many reports of a working Libre registering lower in low numbers than a hand held meter. Which is what the Relion seems to showing. You don't need to test with the meter every 15 minutes at this point, 1/2 hour will do for now. Actually, a rule of thumb I used was 1 hour over 100, 1/2 hour under 100, more frequently under 50.

This is cycle 4 after a big increase, it's possible that this dose is taking him into much better numbers as the depot gets established.

In the summary above (well done on that!) could you also add the Relion readings where you have it? Looks like the Libre reading are what are in the spreadsheet. Was your plan to move forward with the Relion as of today? Don't update your first post, just add a new post when you get new data, so we know something has changed.

As far as tonight's dose goes, let's see how the rest of today's cycle goes first before deciding what to do.
 
Hi Wendy- thank you for your reply. I just tested again and updated the SS as you've recommended (+5, Relion is 105 vs Libre 90)
Okay, I will test every 1/2 hour until we've cleared the insulin peak and then employ your method- that seems like a great testing guideline. Tommy's ears will be grateful to have less pokes, I'm sure.
I was planning on using the Relion for testing after this Libre monitor expires shortly. I will post a new thread in a few hours with Tommy's updated progress to check in. Thank you from the bottom of my heart for your reply.
 
I do like that he's flattening out with those low blues.:cool: Happy to help, we all remember the first panic at lower numbers than used to. :bighug:

You don't need to start a new thread today (we prefer one per day), but you can add a post to this one if things start to look concerning with the numbers.
 
Wendy&Neko said:
I do like that he's flattening out with those low blues.:cool: Happy to help, we all remember the first panic at lower numbers than used to. :bighug:

You don't need to start a new thread today (we prefer one per day), but you can add a post to this one if things start to look concerning with the numbers.
Click to expand...

It's very nice to see the lower numbers! I'm already an anxious person, that cursed Libre hypo alarm just about took me out today :eek: I've gone ahead and removed it from Tommy, I hope that in of itself feels like a relief for him.
Thank you for clueing me in with the forum- I hope I'm not updating this thread too soon, but I have updated readings from the Relion:

+5 105
+6 110
+7 130

I'm going to update again in three hours for our +8-10 values. Having a hell of a time poking and getting a good sample tonight, my poor guy's ears are probably sore.

I hope this isn't jumping the gun, but in the event I am unable to receive feedback later today- assuming Tommy returns to the AMPS value range, would you feel confident giving your kitty the same dosage during the evening? I'm a little concerned I can't monitor him as closely during the night but I admit I am probably still spooked from the Libre's wonky output.

Thank you, thank you :cat:
 
You are doing perfect on the thread. Tommy's numbers are starting to head up on their own. I think you'd be OK waiting until +10 or +11 to test him again. A test that late in the cycle might give you a heads up on what the PMPS could be, and give time to think about what you are going to shoot.

How late after PMPS, if any, can you monitor tonight? If you leave food out for him to snack on and keep himself safe, do you think he'll eat it?
 
8+ 145

Numbers are going back up- I will test again at +11 to check where we're at.
PMPS- I can check on him about three hours after his shot. I am sure he will eat if I leave a meal out for him overnight, that's a great idea.

Thank you so much for checking back in and taking time to help us. I've learned a lot today. Please give Neko an extra scritch on my behalf (=^.. ^=)
 
Wendy&Neko said:
Wish I could but Neko passed in 2016. She taught me a lot. Like many people here, we help out others even after our sugar kitties are gone.
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Oh gosh, I'm so sorry :( I wasn't familiar with some of the terms in your signature, I will be more mindful of this. Neko was a beautiful girl, she was a lucky kitty to have such a loving owner. Thank you for helping the sugar babies going through the same journey. *Hugs*
 
Just my experience with the Libre - it’s not an end of life thing. It’s just a Libre in greens thing.

The Libre is useful, extremely so, for seeing a full curve through the day. And it’s close-enough at higher numbers. But when you get close to an actual BG of 100 (some sensors a little over, like yours), for some reason it starts registering sharp drops. I’ve done a good deal of cross-checking with my last few sensors, and so far they seem to fall into a distinct and duplicatable pattern of misreading. Some have about 30 points of variance at higher greens (for example, reading 60 when the tested BG is around 90), and 40 points of variance at lower numbers (such as reading 40 when BG is really only 80). For other sensors, the variance is 20 points and 30 points, respectively. (Or 15 and 30, on one sensor.) Once I’ve figured out how each new sensor varies from reality (which requires kitty going low enough, then testing with the meter right before or after scanning the Libre at several points during the low stretch), then I can estimate for the rest of the 14 day cycle, with occasional double-checks. And of course once the Libre thinks glucose is below 40 (so actually 70 or 80), you can only use the BG meter.

But it is doable, there is a pattern. You just have to figure out with each new sensor what its variance pattern is. Yours looks like it may have been a 40-50 pattern, which I admit would be a pain.

My theory, for what it’s worth, is that when kitty’s blood sugar gets far enough into healthy range, their body keeps less sugar ”overflow” in the interstitial fluid. Just a semi-scientific guess?

Because of said variance, though, I would imagine the Libre would be more useful long term for someone following SLGS than TR - if you aren’t actively trying to get kitty much under 80 or 90, you can still get a reading from the sensor to reinterpret. But if you’re trying to reach a BG of 50, you’ll have left Libre-readable territory long ago.
 
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Just saying hi and hang in there. You're doing great. I just looked at your spreadsheet and can see why you're jumpy with your first hit of blues and greens after all those pinks, though when I looked at his numbers I thought, what a lovely curve you had today :cool:. Also the ear poking gets much easier once you get more experienced and his ears learn to bleed more easily.

You're in excellent hands here.
 
Skye & Jackson said:
I’ve done a good deal of cross-checking with my last few sensors, and so far they seem to fall into a distinct and duplicatable pattern of misreading.
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A lot of great information here, thank you very much for this write-up. I'm bookmarking for Tommy's next Libre round.

Liz & Minnie said:
Also the ear poking gets much easier once you get more experienced and his ears learn to bleed more easily.
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Hello there :cat: Thank you for the kind words and for taking a look! I'm interested to see what the next few days are looking like and hoping the tests get easier for those little ears.

Tom is rounding out the evening at 311 for PMPS. I'm going to test again in a few hours to see where we're at but I gave him 4u again tonight, I think we're safe. Leaving out a meal also, just in case.

Thank you all so much for the helpful advice, thank you Wendy for walking me through this! I am so grateful. I hope I will be eventually able to contribute and help others as you've helped me today :bighug: a million thanks.
 
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