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

Averaging Glucose Meter Readings

Its a bit counter productive by not testing your reaction to meals at the time of the day they would normally be consumed. If you test your dinner time meal at breakfast your results may be worst case scenario but you may be eliminating a meal that if tested at dinner time may actually result in good numbers.

True, but I've got some pretty unusual waking hours at times! The definitions can become a bit blurred for me. I also like to be a pessimist with things like this. Though I've yet to even verify that mornings (or rather first-meals-of-the-day) do get me the worst results! I have a lot of work to do, but I'm getting there.
 
I do a before food and 2 hours after for my two main meals a day. I use urine sticks to spot trends and to monitor new foods. It seems to work. Diabetic clinic today says gold standard, and have maintained this for over 3 years.
The urine test strips I have seen advertised have a scale starting at 15 mmol/l so not much use for tight control!
 
You need a much larger population of readings of the same situation before you can examine the shape of the distribution with sufficient confidence to start rejecting readings that you may think are outliers. You could in principle build this up over a long run of eating the same meals, but it would need a lot of data to average out all the other factors with an influence (hydration, stress level, what was already in your system before the meal etc etc).

If you could create this data set, then there are indeed stats techniques to identify rogue readings and measurement blunders (eg contaminated strip, unclean test site, dilution of capillary blood by squeezing inter-cellular fluid out of test site etc).

Absent this, the meters are tested for repeatability and against standard solutions (the results are likely documented in your meter user guide - this is certainly the case for contour next). You can also run tests against standard solutions for yourself.

A useful fact to know is that the distribution widens the higher the bg reading is. So low scores are likely more accurate than higher ones.
 
For some purposes, when I want an accurate idea of blood glucose levels, I'll take 3 readings at a time in an attempt to overcome the inaccuracy of my meter (it claims to be accurate to +/- 20%).

Sometimes all three readings are the same or 0.1 mmol/l out, which is nice.

Sometimes however they are quite a broad spread, say for example 5.1, 5.5, 6.1. In this case taking an average seems like a very good idea.

However sometimes it seems more like there is a 'rogue result'. The most recent 3 readings I got were 9.4, 8.1, 8.1.

I've logged down the average as usual, but I strongly suspect that the two 8.1s mean that the 9.4 is likely to be a rogue result. Also in this case 8.1 is more the result I was expecting.

Does anyone have a best-approach to this kind of thing, either based on pure maths or similar experience with their own meter?

Hello, this is where I agree with the Docs here in spain two who informed myself who am pre diabetic, testing fingers is useless tool, non diabetics and diabetics sugars raise, up down, sway here and there by the min and daily only way for more surety althouth all numbers of cut offs for finger testing and A1C are arbitrary set numbers at whim and random, this is why cut offs differ worldwide.

I only take my numbers for curiosity every four months and use two meters, one contour, and the other the fabulous genteel no sore fingers, or pressing for blood it works painless and sucks the blood, and can be used on arm, inner palm, top of knee wherever, using both, to ensure I get more or less correct result, they are normally around the same! Also I might add even every four months the numbers are the same with one or two numbers up or down either way, which clearly shows and proves consistence I take the same time, morning for the fasting, after lunch for the 2hr and 6pm for the random any time, and all numbers are same for last 11 months 85mg/dl 2hr, 89 random and 80 fasting! normal normal normal. No medications.
Keto low carb, walking each day min 4 to 9 klm, no bread, pasta, rice or potatoes whatsoever, and intermittent fasting 3 days a week, lost 21 kilos in 11 months and reduced A1C by 23% in 12 weeks.

I am not a doctor, but I use my inner gut feeling, trust my own body, I know it better than anyone, I do not trust the numbers as I feel diabetes is a big business the number are made for this purpose in my personal opinion, they admit its arbitrary set, thre is no medical or clinical evidence as to why the numbers of cut offs for diagnosis other than "lowering the numbers hopefully means we capture the disease quicker" there is no evidence to this whatsoever, other than, lowering means normal people suddenly overnight become pre or diabetic, that means medications strips, monitors, big business for the pharmas, and not to say a random decision to lower cut off fasting from1 140mg/dl in 1998 to now 100mg/dl leaves grey area of frightening doubt what should the cut off number be? how may people are been wrongly mis diagnosed unnecessarily and more so put on medications unnecessarily just because a man around a table decided to lower the cut off levels overnight?

Until the diabetic world gets its act together and becomes medically professional by that I mean the cut offs for finger and A1C are backed and supported by proof of evidence medical and clinically results to prove the chosen figure, I do not trust the figures, as they are just that random, at whim, arbitrary, and that's why it states, THIS MAY INDICATE YOUR DIABETIC, THE RESULTS SHOW POSSIBLE DIABETIC, that's because no doubt, it is just that indications, but does not necessarily mean ONE IS DIABETIC.

I VIEW THE NUMBERS as caution, use common sense, and any results I have I take with pinch of salt based on the arbitrary numbers in place at this point in time... and don't worry about it. One number or a few numbers not ridiculously under or above the arbitrary cut offs surely is not something one should get concerned about, worry stressed or unnecessary anxiety?

But then I may be wrong in my thinking, but I prefer to continue this until there is official formal and medically backed proof of evidence, as to why the cut off numbers are given and in place, at the moment that is not the case to my understanding.

Mallorca
 
Hello, this is where I agree with the Docs here in spain two who informed myself who am pre diabetic, testing fingers is useless tool, non diabetics and diabetics sugars raise, up down, sway here and there by the min and daily only way for more surety althouth all numbers of cut offs for finger testing and A1C are arbitrary set numbers at whim and random, this is why cut offs differ worldwide.

I only take my numbers for curiosity every four months and use two meters, one contour, and the other the fabulous genteel no sore fingers, or pressing for blood it works painless and sucks the blood, and can be used on arm, inner palm, top of knee wherever, using both, to ensure I get more or less correct result, they are normally around the same! Also I might add even every four months the numbers are the same with one or two numbers up or down either way, which clearly shows and proves consistence I take the same time, morning for the fasting, after lunch for the 2hr and 6pm for the random any time, and all numbers are same for last 11 months 85mg/dl 2hr, 89 random and 80 fasting! normal normal normal. No medications.
Keto low carb, walking each day min 4 to 9 klm, no bread, pasta, rice or potatoes whatsoever, and intermittent fasting 3 days a week, lost 21 kilos in 11 months and reduced A1C by 23% in 12 weeks.

I am not a doctor, but I use my inner gut feeling, trust my own body, I know it better than anyone, I do not trust the numbers as I feel diabetes is a big business the number are made for this purpose in my personal opinion, they admit its arbitrary set, thre is no medical or clinical evidence as to why the numbers of cut offs for diagnosis other than "lowering the numbers hopefully means we capture the disease quicker" there is no evidence to this whatsoever, other than, lowering means normal people suddenly overnight become pre or diabetic, that means medications strips, monitors, big business for the pharmas, and not to say a random decision to lower cut off fasting from1 140mg/dl in 1998 to now 100mg/dl leaves grey area of frightening doubt what should the cut off number be? how may people are been wrongly mis diagnosed unnecessarily and more so put on medications unnecessarily just because a man around a table decided to lower the cut off levels overnight?

Until the diabetic world gets its act together and becomes medically professional by that I mean the cut offs for finger and A1C are backed and supported by proof of evidence medical and clinically results to prove the chosen figure, I do not trust the figures, as they are just that random, at whim, arbitrary, and that's why it states, THIS MAY INDICATE YOUR DIABETIC, THE RESULTS SHOW POSSIBLE DIABETIC, that's because no doubt, it is just that indications, but does not necessarily mean ONE IS DIABETIC.

I VIEW THE NUMBERS as caution, use common sense, and any results I have I take with pinch of salt based on the arbitrary numbers in place at this point in time... and don't worry about it. One number or a few numbers not ridiculously under or above the arbitrary cut offs surely is not something one should get concerned about, worry stressed or unnecessary anxiety?

But then I may be wrong in my thinking, but I prefer to continue this until there is official formal and medically backed proof of evidence, as to why the cut off numbers are given and in place, at the moment that is not the case to my understanding.

Mallorca

Congratulations on your A1C improvement and sticking to a strict diet.

If your body is barely getting a whiff of carbohydrates then maybe you'll get away with not testing regularly, though food intake is not the only thing which can raise your blood sugars, and in any case I don't think many people would recommend not testing!

I hope you'll take this the right way. You do say that evidence may make you change your approach to testing, so here is quite an interesting site which is very good at evidence-based writing and thinking. I hope you'll give it your consideration.

The link will take you to a page which particularly addresses some of the things you mention:

http://www.phlaunt.com/diabetes/16422495.php
 
Back
Top