The FreeStyle Libre—a two-week report

a sensor and reader on a post on the Diabetes DietYou find me, un-sensored and sad… Yes, I’ve completed two weeks on the FreeStyle Libre sensor and reader system, and now I’m back to finger pricks, at least temporarily.

At my last diabetes clinic appointment, my consultant* agreed that I’m a candidate for flash glucose monitoring (which is different from blood glucose testing, but more on that later) and sent me off with a 14-day sensor while I wait for bureaucracy to kick in.

So, what’s flash glucose monitoring like? For the uninitiated, the system comprises a sensor you wear on the back of your arm and a reader that can be used any time. Type 1 diabetes tends to encourage obsessive compulsive behaviour, and the FreeStyle Libre system facilitates that, though it’s no bad thing.

Where flash glucose monitoring differs from blood testing is that the sensor reads levels from interstitial fluid, so it lags about four and a half minutes behind blood glucose readings. If you drive, the DVLA requires you to do blood tests, rather than scans beforehand to avoid the risk of hypos while driving.

Parents love them because they can check children with type 1 diabetes while they sleep, able to work out if they are risk of a hypo, and they are also routinely prescribed for pregnant women who have diabetes as frequent testing makes it easier to maintain the tight control you need while growing a baby.

The accompanying app can be downloaded by others, who can gain access to your information if you give them permission. Again, something that is useful for parents although such scrutiny would have horrified the teenage diabetic me.

Here’s what I found:

Frequency of testing

After a day or so of overcoming the hesitation—I can’t do another test, I just did one an hour ago… Oh. Yes, I can—I averaged 11 scans a day, and about two blood tests usually at the same time to check accuracy and a few times because I was hypo.

Ease of testing

Easy-peasy-lemon-squeezy! You can use the reader through clothing, it only takes a few seconds. It’s much easier than pulling out a meter, sticks and finger-pricker—especially when you’re out and about.

Accuracy of readings

I had the odd bit of disparity—usually if my blood sugar was low, as the sensor lags behind blood glucose readings. However, most of the blood tests I did at the same time varied only by 0.1 o 0.2 mmol, and I did get hypo readings that registered at the same time.

Sensor adhesion

No issues there. That thing stuck to me for the two weeks. I didn’t do any swimming in that time, so I can’t attest to how well it works in that setting. Nor did I try it out in the sauna/steam room as threatened—though one suggestion a fellow user came up with was using cling film to bind it onto your arm. The reader lasted on the battery charge for the full two weeks too.

Most useful bits

There are lots of things that sell flash glucose monitoring to me—ease and frequency of testing two of them—but there are other super-useful components. One is the pattern tool. You can see where you have the most glucose variability and when you tend to have hypos. In the two-week period, I had (ahem) 17 low glucose events, most of them between 11am and 5pm and that corresponded with the time of day I have most glucose variability.

I’ve never been good at logging my blood tests. It just feels too much like hard work. I know you can download from your meter, but the checks I made on the flash glucose monitor gave me a clear idea of what happens. And, more importantly, some ideas of how to fix it.

The excess hypos may have been because of the half-marathon, which happened not long after I started my 14-day sensor and because I’ve been eating more carbs. As we say in the Diabetes Diet, more carbs mean more insulin. Bigger amounts of insulin mean bigger mistakes. A salutary reminder, then, that it’s back on the low-carb for me.

Thanks too, to Steven Morrison—my blog and book co-author’s son—who emailed me in detail about his own experiences using the FreeStyle Libre. He’s a convert too, and the cling-film tip came from him.

So when does my prescription come in? I’m now on a list for a short course at the hospital and once I’ve taken part in that, the organisers write to my doctor recommending she add sensors to my list of prescribed diabetes medications and gear. Fingers crossed, it doesn’t take too long.


* #LovetheNHS

Free Style Libre Trial – My Experiences

free styleMy Free Style Libre trial ended this week. Was it a good/bad/in different experience?

The Free Style Libre is a new way of testing your blood glucose levels. You attach a sensor to your upper arm (right arm if you’re left-handed like me and vice versa), and then you use a reader to scan the sensor and it gives you your results in a second.

You can also see what your blood glucose has been doing for the last eight hours, and you can tell if it’s going up or down, quickly or slowly, or staying stable.

Calculating Insulin Doses

There’s also a feature for calculating insulin doses, and you can use the reader in the traditional way to test blood glucose through a finger prick if you have the strips suitable for the system. I didn’t use either of these features.

It was interesting. As someone who only recently managed to get out of the slightly obsessive compulsive blood testing habit, I scanned a lot. It’ll be hard to go back to limited tests. Seeing what your blood sugar does over eight hours – particularly overnight – is also fascinating.

In general, my blood sugar dips first thing, and then rises through the hours of the morning – something I believe is common in most people.

Checking Levels

I liked it because I could check frequently. Do I think it improved my overall control? Too hard to tell and two weeks doesn’t give you that knowledge. Would I like to keep it? Yes. It’s wonderful being able to check your levels whenever you want. Jokes aside about obsessive compulsive testing – and actually, I didn’t do check half as much as I thought I would – knowing that you can check whenever you want is liberating. I get through five boxes of 50 blood testing strips every two months and sometimes it’s feels as if I’m eking them out, as that works out as less than five strips a day.

As I said in my original post, which you can read here, the biggest drawback of the Free Style Libre is that it is not available on the NHS. The sensors need to be replaced every 14 days and they cost £56 (£48 when you apply the VAT exemption you are entitled to as a type 1 diabetic), which works out at £1,248 a year if you use it all the time.

Occasional use is an option though. It would be nice to have a few sensors in stock for that possibility.

Have you used the Free Style Libre – or is it something that appeals to you? What do you think the benefits to you could be? We’d love to know.