Glucose Tolerance Test?

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Glucose Tolerance Test?


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Old 07-19-2014, 15:54   #1
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Default Glucose Tolerance Test?

Can one do their own GTT at home using a BG meter?

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Old 07-19-2014, 16:01   #2
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Yes.

To duplicate the lab test, you need 75 grams of glucose that you dissolve in a glass of water.

Take your blood sugar before you start.

Then swallow the solution reasonably quickly (I think it's supposed to go down in less than five minutes).

Then measure your blood sugar regularly until it returns to normal.

But why would you want to do this to your pancreas? It won't prove anything to your doctor and you won't be very comfortable during the process.

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Old 07-19-2014, 16:11   #3
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Default Bagel test

John,

How would this compare to the bagel test I think I read about in Am I Diabetic somewhere on this website? Eat a bagel with about 60 to 70 g. of carbs and test BG at one and two hours. What readings would a non diabetic get on either test?

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A1c 5.7, FBG 99, FI 2.3, Total Cho 185, tri 90, HDL 60, LDL 107, Vit D 81, BP 100/50, resting HR 36, max 175, carotid intima thickness (IMT) right=.77, left=.78
May 1, 2014 began LCHF, stopped statin
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Old 07-19-2014, 16:55   #4
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First, I'm neither a doctor nor a biochemist and my response is based purely on my basic understanding nothing more.

Your first post on this thread asked about a clinical OGTT. That requires the use of a known quantity of fast acting glucose if it's to be even approximately equivalent to the lab test. Pure glucose does not require to be digested and passes straight into the blood stream in something under fifteen minutes. That's one of the reasons that the act of swallowing is strictly limited in time.

Your bagel test uses a product where its content is only approximately known and its speed of action very much open to discussion. So although the total carb content might be roughly the same, it won't deliver the same results as that carb content has to be digested to register as blood glucose. That might take a couple of hours if you pick the right bagel.

As to results - please see the first line of this post. My guess is that a non diabetic would hardly see a flicker with the bagel but would see some degree of spike with the glucose.

My question stands - what's the point?

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Old 07-19-2014, 18:11   #5
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Bob? A rose may be a rose is a rose is a rose, but a carb is not just a carb. There is no comparison between 75g of liquid glucose which will hit your blood stream hard and FAST (in mere minutes), and a bagel, which must digest in order to get into the bloodstream.

I'm not sure what you're trying to prove here, but I can assure you I would never be found subjecting my own diabetic body to such an assault. If you're committed to lowering your blood sugar, then get on with it. Whatever purpose you think is served by an OGTT, I think you're missing the point.




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Old 07-19-2014, 18:45   #6
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I did the "knock-off" version of the OGGT recommended by the site "Blood Sugar 101". Why?

I was told that I was pre-diabetic based on a FBG of 100 and an HA1C of 5.8. Doctor's notes recommended reducing sugar and exercising more. First, I am probably in the top 5% in fitness for a woman my age! Second, I have Thalassemia (a genetic anemia) which can invalidate HA1c results and finally, I have Celiac Disease which requires me to be gluten free. I had two choices: 1) follow my doctor's advice and wait another year which could be bad if I really was becoming a diabetic or 2) research and determine if I have an insulin resistance issue and radically change my diet again!

I got a big spike after consuming a cup of rice. I began tracking my meter results and went back to my doctor with the data in hand and 15 pounds lighter. I really did consume a lot of sugar despite burning it off on my bike.

He agreed that I have an issue. He wants me back into the office for another HA 1c test in another month and further discussion or testing regarding type (there is a strong link between celiac disease and type 1), but we agreed that my diet was working. I need more time to heal from celiac disease so that I can affectively absorb Metformin, if and when, needed.

So, by doing this simple test, I was able to see for my own eyes that I am a diabetic (or at least on my way) and changes to my diet could prevent my diabetes and complications from progressing. Nothing keeps me on track than testing to my meter!

I would not try a home version using 75 g of glucose. I would do that test in the doctor's office for safety reasons. Just drinking that stuff while I was pregnant was awful!

But, Bob's signature states that he has been LCHF since May. I think he would have to eat normally for three days before consuming rice or that plain bagel. It has been a while since I have been on the "Blood Sugar 101" website, so I am not sure.

I hope this helps.

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Old 07-19-2014, 21:09   #7
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Quote:
Originally Posted by cyclinglady View Post
I did the "knock-off" version of the OGGT recommended by the site "Blood Sugar 101". Why?

I was told that I was pre-diabetic based on a FBG of 100 and an HA1C of 5.8. Doctor's notes recommended reducing sugar and exercising more. First, I am probably in the top 5% in fitness for a woman my age! Second, I have Thalassemia (a genetic anemia) which can invalidate HA1c results and finally, I have Celiac Disease which requires me to be gluten free. I had two choices: 1) follow my doctor's advice and wait another year which could be bad if I really was becoming a diabetic or 2) research and determine if I have an insulin resistance issue and radically change my diet again!

I got a big spike after consuming a cup of rice. I began tracking my meter results and went back to my doctor with the data in hand and 15 pounds lighter. I really did consume a lot of sugar despite burning it off on my bike.

He agreed that I have an issue. He wants me back into the office for another HA 1c test in another month and further discussion or testing regarding type (there is a strong link between celiac disease and type 1), but we agreed that my diet was working. I need more time to heal from celiac disease so that I can affectively absorb Metformin, if and when, needed.

So, by doing this simple test, I was able to see for my own eyes that I am a diabetic (or at least on my way) and changes to my diet could prevent my diabetes and complications from progressing. Nothing keeps me on track than testing to my meter!

I would not try a home version using 75 g of glucose. I would do that test in the doctor's office for safety reasons. Just drinking that stuff while I was pregnant was awful!

But, Bob's signature states that he has been LCHF since May. I think he would have to eat normally for three days before consuming rice or that plain bagel. It has been a while since I have been on the "Blood Sugar 101" website, so I am not sure.

I hope this helps.
I have 75g of glucose sitting here in a zip-loc and have contemplated doing a home OGTT for a few months but have yet to get up the courage. You mentioned "safety". Do you think there are actually dangers in ingesting 75g of glucose? My wife has done several (while pregnant) and found them pretty unpleasant, but nothing near "dangerous". OK, so I'm diabetic so I might hit 250 or even 300 for a little while, but I don't think there's any significant danger in that. It takes long periods of hitting those levels regularly to actually cause harm. I wouldn't do it while driving, but I would think that doing it at home would be perfectly safe - even if not so much fun.

My interest was to do it annually - without any prior "carb-loading" - and compare them to each other. Sort of a crude way of assessing whether my condition is improving, degenerating or staying the same.

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Old 07-20-2014, 14:08   #8
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Dangerous is not a word I should have used. I am the type of person who has reactions all the time to procedures and meds. I have made too many trips to the ER or reacted in the hospital, but that is just me. I was speaking emotionally.

But why bother testing if you have been diabetic for years? It just proves that you have an insulin resistance problem and you already know that.

I do not know my type yet, but just monitoring my FBG and post meals (only occasionally now that I adhere to the LCHF diet) should let me know if I am continuing down the road where I may need meds or insulin to function. And, from what I read, eating LCHF for a while will tweak any results on OGTT test.

I want to save my beta cells as much as the next person. But that may be beyond my control. What I can control is my diet which should help prevent further complications and maybe prevent, in my case, another autoimmune disease from developing.

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Old 07-21-2014, 22:06   #9
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Quote:
Originally Posted by 1xs View Post
Can one do their own GTT at home using a BG meter?
Even if you did it yourself, the info it will give is only a small part of what you want to know - which I assume is: "Am I becoming diabetic or getting worse?"

I am assuming you want some insight into your possible condition before seeing your doctor. You say already started LCHF on May 1st but we do not know if the A1C of 5.7 was before that or just very recently (which might mean the 5.7 was after just 2 months and 3 weeks of LCHF).

I assume you have a meter. Time to take a bunch of readings! Tomorrow morning take a reading first thing in the morning as a baseline, then immediately go eat the very same breakfast that you most commonly eat every morning (not necessarily LCHF - although you did mention you might currently be on LCHF?... whatever you typically like to have for breakfast these days).

This will just be the first of many tests you will want to do to establish what foods you personally can and cannot eat. Note the time that you take the first bite of food - that's zero hour and ideally that "pre-first-bite" test is under 100, but don't sweat it regardless of what result you get. At one hour take another test - is it under 140? At the 2 hour mark take another test - is it under 120? If you like take a 3 hour test, by that point you should be heading down to the zero hour level - if not then let us know what it was and specifically all the things you ate.

That 5.7 A1C that you got is exactly the same reading that I got recently - but mine was 6 months after I had a 6.7 and had been on LCHF and 1000mg Metformin for that same 6 months. So all by itself it is an interesting thing to know but does not provide as much insight as a whole bunch of daily tests based on the real foods you are intending to eat day in and day out.

Same with the GTT you initially asked about (or looking to simulate actually). All by itself it is an interesting thing to know (maybe more so for a doctor?), but unless you are intending to write a book entitled "The 75gram Glucose Diet - Why I Did It" by Bob, it is less useful than the real readings from real food - especially if you would like feedback from the great folks on this forum. Of course I am no doctor, and your doctor might want to see a GTT result, if so then so be it - but your original post states you are not taking a GTT for a doctor's analysis benefit anyway - and I am not sure if that result (examined in isolation) would be useful info to lay persons like all of us(?)

Once you have the numbers from the breakfast experiment you also want to test individual foods that you commonly include in your diet. If you are still on LCHF which you indicated you started in May, then donít test things like the fats or meats - instead choose any cheat foods you still like to indulge in and anything with the highest carb listing on the package. That will give you some numbers you can them throw at the forum and the folks here can directly relate to result they get eating that same thing.

And of course keep records of all these numbers with notes of what food they link up with.


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