Hello
@SpikeUK, welcome to the forum.
Well done to you for taking an interest on behalf of your friend. I have an unusual form of Diabetes because I surrendered my pancreas todefeat Pancreatic Cancer. As a result I have what I consider to be 'brittle' diabetes and while my Consultant has never recorded that in any written correspondence, she also has never contradicted me in any meeting. So I think this 'brittleness' is probably subjective and not comprehensively defined.
One UK website (and I advise caveat any Google searches to be for UK, because diabetes as a topic is confusing and contradictory in it's own right, without being deflected by so called experts from elsewhere in the world) says
Brittle diabetes is a term used to describe type 1 diabetes that is particularly difficult to control. If you have brittle diabetes you’re likely to experience frequent, dramatic swings in blood glucose levels and are at risk of dangerous periods of hypoglycaemia and hyperglycaemia.
londondiabetes.com
Brittle diabetes is a term used to describe type 1 diabetes that is particularly difficult to control. If you have brittle diabetes you’re likely to experience frequent, dramatic swings in blood glucose levels and are at risk of dangerous periods of hypoglycaemia and hyperglycaemia.
Brittle diabetes is not just frustrating, it can have serious implications for your current and future health.
I have selectively curtailed this cut and paste, stepping away from that site promoting how brilliant they might be! But significant for me is that the above definition specifically says for Type 1 - I am as if T1, but definitely not T1. Yet I seem to have brittle diabetes and certainly have to manage my D from that start point.
Diabetes UK (DUK) [Note this is the site that sponsors this forum and is the official point of reference for the NHS - diabetes.org.uk/...; with blue headings not the red topped site diabetes.co.uk, which is commercially sponsored from USA] have a useful intro to what is diabetes :
Diabetes (otherwise known by the scientific name diabetes mellitus) is a complicated condition and there are many different types of diabetes. Here we'll take you through everything you need to know. What is diabetes? Diabetes is a serious condition where your blood glucose level is too high. It...
www.diabetes.org.uk
If you scroll down a bit you arrive at their definitions of different types of D, all of which gives you some insight into the overlying complexity of Diabetes.
Diabetes (otherwise known by the scientific name diabetes mellitus) is a complicated condition and there are many different types of diabetes. Here we'll take you through everything you need to know. What is diabetes? Diabetes is a serious condition where your blood glucose level is too high. It...
www.diabetes.org.uk
Note DUK don't specifically refer to brittle D as a type of D in its own right.
So, I would suggest you be sure that you clarify if your friend's diabetes is formally categorised as brittle. This is solely just in case you end up involved in helping her gain emergency medical help; under that circumstance you can confidently say your friend is T1 with brittle D, or is T1 and with what seems to be brittle D.
Moving on, it is really good that your friend has a Dexcom CGM; does she also have a lancing device and associated BG test meter? The CGM is very helpful in providing alerts (or alarms) to tell the patient as soon as their BG is changing, particularly when BG is falling. What model of Dexcom specifically: Dex One, One+, G6 or G7. Each has their differences both in the details they display to the user and the potential alert settings. I am a strong believer in making full use of Dexcom's alerts: tell me when there is a problem coming, is way more preferable to sounding an alarm when it is too late to do anything about it. What setting does your friend have their Low alert set at?
There are limitations to the use of CGMs and it is important that your friend is aware of these limitations. It would be sensible if you also had some awareness of these. A link to a thread on this site is below.
https://forum.diabetes.org.uk/boards/threads/cgm-limitations-and-precautions.108188/
I think that is enough for the moment. While I've been writing this
@Docb has snuck in, also highlighting that the term brittle can be ambiguous. If you can provide a little more detail about your friend's diabetes type and origins, including how long she has been managing her diagnosis - then we can provide comments that are more focussed and pertinent, with an understanding of how much your friend already knows and is happy about. Do keep asking questions, no question is stupid; we all started as newcomers to D.