• Guest - w'd love to know what you think about the forum! Take the 2025 Survey »

Fasting glucose and CGM

A

aris

Well-Known Member
Messages
126
Type of diabetes
Treatment type
Tablets (oral)
I've seen people on this forum mention their fasting glucose numbers, seemingly determined from their CGM.

How are you all doing this - what number are you looking at and when? Or am I misunderstanding.
 
Evening @aris.

Most of us on the FBG thread for type 2s (and the parallel thread for all comers) test on waking; not because it's the 'correct' fasting level, but because logging the reading when we wake makes the conditions pre test as close to identical as possible. It provides a useful benchmark for day to day comparison.

Type 2s: What was your fasting blood glucose in a morning? (very low chat level)

11.6 this morning :(
www.diabetes.co.uk www.diabetes.co.uk

Our BG numbers rise once we start to move around. That's normal and to be expected.
 
Ok, that makes sense.

I'm still trying to underst what behaviours change it. Sometimes my base level (outside it being affected by food) during the day is in the 5's sometimes it is in the 6's. I can't fig out what is causing the variance.

I'm ok with both, but I'd rather be in the 5's.
 
aris said:
I've seen people on this forum mention their fasting glucose numbers, seemingly determined from their CGM.

How are you all doing this - what number are you looking at and when? Or am I misunderstanding.
Click to expand...

I might be misunderstanding you if so sorry but here goes.
I don’t know if you are familiar with CGM’s but they monitor BG ( well indirectly) 24/7.

Attached is a snapshot of a day of when I was wearing/ using a Libre 2 sensor.

FYI I’m a well controlled pre diabetic and the graph is one I’m proud of .
But anyway as you can see from the graph you can see what your BG is doing at any time of day.

Much like has been described by using finger prick testing you can log events on the CGM to know when you have eaten etc.

I hope I’ve understood and this helps.IMG_1367.jpg
 
I using a cgm too. Just wanted to know what number people were using when quoting fasting glucose. Waking makes sense. You been fasting since last meal.
 
aris said:
I using a cgm too. Just wanted to know what number people were using when quoting fasting glucose. Waking makes sense. You been fasting since last meal.
Click to expand...

OK my bad.

When using the CGM as I did to nail down my diet yes I logged on waking . A while ago my BG used to rise very early morning but that settled.

Sorry for the confusion
 
aris said:
I using a cgm too. Just wanted to know what number people were using when quoting fasting glucose. Waking makes sense. You been fasting since last meal.
Click to expand...
Fasting glucose is all BG levels between some 8 hours after last meal and first eating.
If the level fluctuates during this time, it only shows that fasting glucose doesn't tell all.
 
aris said:
Ok, that makes sense.

I'm still trying to underst what behaviours change it. Sometimes my base level (outside it being affected by food) during the day is in the 5's sometimes it is in the 6's. I can't fig out what is causing the variance.

I'm ok with both, but I'd rather be in the 5's.
Click to expand...
I've been doing waking (or more precisely "just after first wee") testing since 01 April 2020, and still can't see any rationale
Basically I think
4s rare, but nice
5s good
6s OK
7s hmm, is something going on?
8s check for infection/illness

I'm mostly 6s, and that's seems OK. I am due an hba1c soon. I just can't worry about daily variances, there's not enough time and too many variables that can affect it eg
Sleep, quantity and quality
Exercise, quantity and intensity and duration
Food
Medication
Stress
Temperature
Alcohol
Genes!
And probably more.
Too many for my little brain ;)
 
MrsA2 said:
I've been doing waking (or more precisely "just after first wee") testing since 01 April 2020, and still can't see any rationale
Basically I think
4s rare, but nice
5s good
6s OK
7s hmm, is something going on?
8s check for infection/illness

I'm mostly 6s, and that's seems OK. I am due an hba1c soon. I just can't worry about daily variances, there's not enough time and too many variables that can affect it eg
Sleep, quantity and quality
Exercise, quantity and intensity and duration
Food
Medication
Stress
Temperature
Alcohol
Genes!
And probably more.
Too many for my little brain ;)
Click to expand...
Thank you. Good to know it isn't just me

Going to keep trying to get it steady 5's if I can.
 
Back
Top