Dexcom One CGM - In Review

It's been a number of years since I last used a Dexcom CGM. In 2018 and 2019, I used the Dexcom G5 followed by the G6 and my experience was "patchy" for various reasons. So, it was with hesitancy that I accepted the Dexcom One "Starter Pack" during my latest diabetes review appointment. It was offered to me following the sharing of my experiences of Freestyle Libre 2.

Firstly, how wonderful to have a choice of blood glucose tech. I know most areas in England and Wales are offering a choice of Libre 2 or Dex One yet many are still finding it difficult to access one or the other - mostly Dex One - at the time of writing this blog post.

The Starter Pack contains everything you need for 10 days CGM use - 1 transmitter and 1 sensor. You'll need to install the Dexcom app on your phone and create an account if you don't have one already. Then, you're ready to go!

You'll need to "pair" your phone with your Dexcom One transmitter. Pairing is a simple process, just follow the steps on your phone screen. Once you are paired up, you can insert the sensor using the single use applicator. By the way, be sure your phone is compatible with the CGM. Dexcom will have a list of compatible handsets on their website. 

The sensor applicator looks and feels a little like a computer mouse. There is one orange button to insert the sensor under your skin and a small protective orange strip to cover it. You'll need to snap that off before you press the orange button. You'll also need to remove the two slips of paper that cover the sensor adhesive area. Once the paper is removed, hold the applicator against your skin and press the button. Sensor inserted! Just ease away the applicator and dispose of it as best as you can. It's a pretty chunky lump, making recycling difficult. Some have suggested breaking it up with a hammer to make recycling easier. I think Dexcom could do a lot more to be planet friendly, here.

Before you go waving a hammer around, pop the transmitter into your sensor. Next, follow the app instructions to begin the warm up process. If you've never used a Dexcom CGM before, then get ready for a wait. The Dexcom One takes 2 hours to warm up so, maybe don't do this right before bed.

The warm up process was problem-free and BG values began to appear. The first few readings were pretty close to my actual blood glucose. "Great!" I thought, until my BG dropped so low that numbers became letters on the Dexcom app. However, I wasn't hypo. Things didn't get any better for a good 6 hours, throughout that time I remained outside of the hypo zone. I decided to let the CGM "bed in" and, erm, go to bed.

I don't know if it was just really tired from sitting in a box on my living room floor for a few days, but the rest seemed to do the CGM good! Fasting BG in the morning was very close to the Dex One number, which was also very close to the Libre 2 number (I'm wearing both devices at the same time). 

Heading towards 7 days with Dex One, I've become comfortable with it and I have begun to trust it. Compared to Libre 2, it has been closer to my actual BG for more of the time.... just! The difference between the two is very minimal for me. L2 is reading a little lower (it usually does) than Dex One, but not by worrying amounts. 0.5 mmol perhaps as an average.

Accuracy aside, the Dexcom One app is a very stripped out affair compared to LibreLink. It will offer some eA1c info via Clarity and some Time In Range data, but there is no place to leave notes and no way to screenshot the app. Read this in your best Nick Jonas voice - No screenshots? Really?! Some of you are going to suggest using third party apps and you're right. You can screenshot and note leave using different apps. However, I'm not a fan of unofficial apps when it comes to my data, support, security, yada yada. Also, the tech newbies don't want to be overwhelmed by having to install multiple apps to do things they could do with one app on LibreLink. I'm not a newbie, I'm just big hearted and I care about the people who are.

The app is my only gripe, really. Yet, it works and how often am I going to leave passive-aggressive notes about the sensor accuracy? Do I really need to screenshot my BG to encourage keto diet zealots to question how long I'll be keeping my toes with those numbers? Maybe not. I've drifted off track. My gripes aren't a big deal. They're little annoyances. The important thing is the CGM works well. At least, after the first 6 hours.... 8 hours if you include the warm up. Yeah, that first day is pretty annoying. I can accommodate that, though.

What else? 

- It's ergonomic. No sharp edges to catch on clothes, bed sheets, other humans, etc.

- It's simple to set up. Minimal steps and great on-screen instructions.

- Satisfactory accuracy vs Libre 2.

- 10 day wear isn't wonderful. That's 3 sensors per month vs the near 2 for Libre.

- 90 day transmitter usage is... okay... remember GlucoMen Day have rechargeable transmitters that last for 5 years.

- Waste could be better. That big lump of applicator, 3 times per month. Eeek.

That's about it. Soon, I'll need to make a choice for NHS purposes. Dexcom One or Libre 2. Which one do you use? Have you been given a choice?  

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HbA1c and Time In Range

As I wrote the title to this blog, I immediately worried about how boring it might be. When you are diagnosed with diabetes, pretty much any type, then numbers and data (hence the image above) quickly become a part of your life. Firstly, I promise that this post will not be examining any numbers in great detail - that would be horrendously dull and you're probably not here to find out what my HbA1c and TIR currently are. If you are, then I'll tweet those numbers especially if they're good ones! 

Shall we start wth HbA1c? You might get yours in a plain number format or a percentage and it gives a reasonable indication of how well things have been going over the last 90 days. Or does it? An average, kind of, number based upon your blood glucose? Hmm. Perhaps if your BG is generally very stable and it's floating around in the happy zone for the majority of the time then your A1c might reflect that you're doing well. What happens if you're having several hypos per day, over treating them, and correcting several hypers per day? Lots of numbers such as 2, 3, 18 and 19 might be on your CGM/Flash/BG Meter and your time in the happy zone might be very infrequent yet your HbA1c might show that you're doing quite well with it's average BG offering. Clearly, you're not and that's why HbA1c alone can't be trusted to give an accurate picture of your diabetes management.

Time in Range seems like a better way of monitoring how well things are going. The picture is more detailed with this data. We can identify problem periods of time and change what we've been doing to reduce those instances. Time in Range data may just be one of the most simple yet brilliantly effective innovations in diabetes care in the last decade. I wonder how many of you have left a diabetes review with your HCP with the news of elevated HbA1c ringing in your ears? "It's too high, you need to get that under 8%... around 7%.... 6.5%?" and you nod and agree and off you trot, back to work or home, with absolutely no idea why your A1c is elevated. Perhaps it was that sandwich? or maybe your entire diet?! Oh no! "Keto, that'll solve it". Well, maybe. 

Time in Range should help to stop the overreacting to HbA1c results. If it's a bit high, all that data can be looked through and if you leave notes on your CGM/Flash device app then it's even easier to identify what might have caused the hyper on that day.  

Can TIR be problematic? 

I'll wager that you've seen a few 100% TIR screenshots on your socials. Maybe you've reached the unicorn zone, too? It's a nice feeling even if it's not really that much better than a 90% or 80% TIR. Of course, 100% doesn't always tell the full story. If your TIR was at 100% over 90 days but your BG was between 8 mmol/l and 10 mmol/l in that period then your A1c would reflect a more sketchier management compared to the incredible management indicated by the 100% alone.

100% over 90 days is likely impossible for most but a high TIR might also indicate inaccurate CGM/Flash readings. I don't know of a single device which hasn't had accuracy questioned or complained about on social media. That includes me, I've made noises about inaccuracies dating back to 2017 and the issue is still a big one, six years later. Artificially inflated TIR might be noticed by a higher than expected HbA1c - just as the fictional blood glucose diaries of old proved, the wrong numbers from BG checks can be picked up when your A1c comes back at 11%  

Also, numbers and targets and TIR can get a little overwhelming for some. Some feel an incredible sense of failure because their Time in Range is 69% and they've read that it needs to be 70% or better. That's such a shame because 69% TIR is probably pretty good! and 1% off your "goal" is such a small amount. 5% is a small amount, so is 10, yet not reaching that target number can deeply affect some.

Also! You're not a number. Your life is wonderfully unique to you and your diabetes will likely reflect just how much time and energy you have to manage it. In the late 1990s, during one of my infrequent diabetes reviews, a consultant decided that it would be motivating for me to know of the previous patient's HbA1c. The guy walked by me on his way out of the building. During my consultation, I found out what his first name is and his last HbA1c result. "X is doing brilliantly, his A1c is..." Can you imagine being offered that information at your next review? There would be uproar on socials and I'd be leading the roaring. In the 90s, I was less concerned but I responded sarcastically (Me! Sarcastic? No!). It left me feeling totally uncared about by that diabetes team. My hurt aside, the guy with the great A1c was also being viewed as a number! What a crap time to be a diabetic. Things are much better now. At least they should be for us all, as diabetes care has evolved hugely.

Back to the subject! It seems to me that HbA1c and TIR can be useful when viewed together. Alone they can be problematic and as much as HCPs and your peers might focus on those numbers, please remember that they are just numbers and not your wonderful unique diabetic self.

Sorry if this post was a bit "numbery" and boring. 

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Diabetic Christmas

Ho ho ho! Merry Christmas. It's that time of the year again! Fun, food and excess are on the agenda for many, including the diabetic community. Whaaaaaaaat? But, you can't have excess, food or fun if you have diabetes, can you?!

If you were to pay attention to many media outlets, websites and the social media accounts - often claiming to be a diabetes expert, doctor, lifestyle coach or miracle worker who can cure you of diabetes and herpes (!?), then! you might be forgiven for believing that Christmas and diabetes do not mix. I can't and won't talk about your diabetes in relation to Christmas, that's a ridiculous thing to attempt because I know very little about you and your diabetes or how Christmas impacts upon you. The common use of "We" when diabetes advocates talk about the condition has never sat well with me. "We" suggests to me that a person is expressing the views or conveying the words of a community largely or entirely. In reality "We" refers to the person behind the keyboard or microphone and perhaps a relatively small number of people who have diabetes. It's totally alright to use the word "I" when expressing yourself, I promise. So, with that little rant off my chest *I* have a few things to say about T1D and Christmas.

T1D because that's the diabetes I live with. I'm a Type 1 Diabetic. 

Christmas has historically been a tricky time of the year for me especially those first few years as a recently diagnosed diabetic. Looking back, the avoidance of chocolates and sweets and pursuing precise carb counting seemed very reasonable at the time. Strict "control" was hammered into me and my parents. Of course, I stole sweets and chocolates and had strangely elevated blood glucose for several years at Christmas time. That advice and care seems a lifetime ago and indeed it is, I've recently passed 38 years with T1D. Today, there is no advice offered to me unless you count the unsolicited, largely nonsense, advice offered via the sources mentioned above. Christmas was a tricky time but no longer. Why?

Education has played a large part in understanding my own T1D. That has emerged through the lived experiences of my friends and peers and, to some degree at least, the official information published by recognised authorities on the subject. Alongside the education, the tools of 2022 are a million miles better than the tools of 1984. Come to think of it, the tools of 1984 weren't much of a thing at all. Finger pricking took an age and involved popping down to B&Q for a colour chart. Berocca style tablets had to be dropped into a tube of your own urine and injecting insulin involved borrowing a javelin from Tessa Sanderson and mixing two different types of Banting Juice together yourself. Definitely not the good old days and before 1984 it wasn't exactly a rose garden either. The tools of today are simply incredible in comparison. A tiny pump and a CGM are attached to me and they're helping me to effectively manage my blood glucose and live a much less burdensome life than in the years gone by.

Less burden, well managed blood glucose... it sounds like Christmas might not be such a stressy diabetic experience now. It's not for me. If I know the carb count, I bolus for it. If I don't know the carb count then I'll guess and correct any mistakes later on. The CGM alerts me when I'm high or low OR even when I'm within 15 minutes of a high or low event. I can relax and enjoy what any other person might do during Christmas. That never seemed like a possibility to me when I was young and I'd simply given up on the idea of an easier diabetes during my 20s and 30s.

Apparently, life begins at 40! My diabetic life has certainly gone through a renaissance since I hit 40, since I grabbed the little shit by the neck and took charge, since I embraced and accepted it, since I discovered a huge community of peers - dozens of whom are now really great friends, since I pushed for the technology which I need to lift the burden and improve the numbers which I get a little obsessed about from time to time. 

A Diabetic Christmas feels like... Christmas! to me, at least. I hope it feels like that to you and that you have a relaxing and fun time with the people you love. If you're struggling for any reason then please don't feel that you're doing anything wrong. You're not a bad diabetic! Help and support is available through so many avenues that it would be almost impossible for me to list them all. Instead, don't give up. Seek the help that you need and push for the support, information, medications and technologies that you need for you and your diabetes. Merry Christmas.

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Use The Force

 

Do you ever look at a meal, a plate of food, a snack and just know what the carb count is? Maybe you've gone a step further? Not only do you know the carb count but you know exactly what to bolus and when to bolus to get your blood glucose back into range, soon after you've eaten.

Do you sit there, feeling all smug like some kind of diabetic Yoda? Good! You probably should. Diabetes is work and getting things right is something to celebrate.

I think we "use the force" in many aspects of life, particularly health. I'm willing to bet that some of you have guessed what dose of pain relief you needed for a headache. One paracetamol... two... maybe two with a couple of Ibuprofen, a few hours later. Wow! it worked. The headache is gone. Headache Jedi, we are. (sorry)

I'm not sure Obi Wan & co. can take the credit for our health treatment successes. I think this is because we know our bodies and how they react. Sometimes we make conscious decisions about our health and sometimes things just seem to go into autopilot. Sadly, as we age and get more experience of ill health I think we retain a subconscious knowledge which we call upon when treating common ailments or, indeed a chronic condition such as diabetes which we've become conditioned to living with.

You might refer to the bolus doses and carb counts as guesses but, after a while with diabetes, I'm not sure that's entirely true. All those meals and injections (or pumps), the maths, getting it right or wrong and the information presented to us or felt by us physically - does it just vanish or is some of it stored inside our heads beyond memories of the events? Easy, Diabetic Dad, this is getting deep.

Take hypos. (Please take them!?). We're told what to consume when we're below a certain level of blood glucose. If you're dropping 0.1mmol every 5 minutes and you've just crept into the red zone then sure, you might stick to the rules and eat the recommended amount of carbs because you know you're not in any real danger. If you're dropping 0.5mmol every 1 minute, you're shaking, rapidly heading south and your back looks like a waterfall then you're unlikely to be sticking to the rules because you're not thinking clearly, you might be panicking and hypo hunger is a real thing sometimes! Yet, you probably realise that you're in greater danger at that stage. You probably realise that counting out 6 Jelly Babies isn't very important. You probably realise the only number that needs to be given any attention is the one on your BG meter or CGM. Let the feasting commence! That may have happened to you previously. It's certainly happened to me; a time where little thought or brain power is used, it's all action and a carb frenzy. Then you feel better. Later you're a little high but you're not in danger so your brain drops out of survival mode and you calculate your insulin correction dose. Of course, some of you might be lucky enough to have the technology which informs you of you insulin on board, the speed of the decline of your blood glucose and how many fast acting carbs you'll need to consume. But... perhaps you have that tech and you still go overboard because of survival autopilot.

I know I've used the words "You" and "Your" and "You're" several times, there. That is just a generalisation of what some people living with diabetes might have done, including me. I do dislike talking about the diabetes of others in a way which must reflect my lived experience. That would just be terribly wrong of me.

Moving on! and to conclude, I think we as people with diabetes, regardless of type, are under tremendous stress and we carry a huge burden by simply living with our condition. The number of additional decisions made per day, compared to a person without diabetes, is huge. Those decisions require brain power which can sometimes be utterly exhausting. I think it's entirely normal to sometimes trust in your instincts, subconsciously act and "use the force" to act or react in regards to your diabetes management.

Thank you so much for reading this blog. I do appreciate your visit and your support. As you might know, I LOVE COFFEE! So I've teamed up with a thing called Buy Me A Coffee. If you enjoy my content and appreciate the time it takes to create such things then you can buy me a coffee! If you leave your Twitter @ name when you buy me a coffee, I will personally thank you. If you'd rather be anonymous then that's totally cool. Thanks for the caffeine!

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