Simple Question??? FASTING

By firstflight800 Latest Reply 2010-04-21 23:46:40 -0500
Started 2010-04-20 18:49:27 -0500

I had to fast for a blood test. I begin work so dang early in the morning. I had a glucose of 94 when I went to bed. 93 when I woke. I had nothing during the day but "water" and checked my glucose again at noon and was 111. I think I was back to 103 before the blood test. HOW can glucose rise when I've not had anything to eat?? There are times when "fasting" seems to "create" glood glucose. Then again, there are times when I've gone to bed after taking a "small" chocolate snack and woke to numbers below 80. Any ideas about this?? I take metformin with morning and evening meals, and a shot of Lantus in the evenings.

5 replies

Zimoss 2010-04-21 23:46:40 -0500 Report

I used to have similar problems… one thing to remember is that if you are doing "work" of any kind that your liver will automatically release glucose to fuel your body — regardless of if you are using it or not.

The other potential issue could be Somogyi Effect — When blood glucose levels drop too low, the body sometimes reacts by releasing counterregulatory hormones such as glucagon and epinephrine. These hormones spur the liver to convert its stores of glycogen into glucose, raising blood glucose levels. This can cause a period of high blood sugar following an episode of hypoglycemia.

(see for more info)

Just a suggestion… you might also ask if there is a better way to do your labs since you are up so early that you can't do them first thing in the morning (maybe a weekend?)

Miminv 2010-04-21 05:14:56 -0500 Report

I have been taking Lantus for a couple years. Lantus reacts differently to what you eat before you go to bed and what you have eaten during the day. It takes several hours and for some people a day for food to digest. Different foods also can take longer to digest. Something I do if my numbers are off is to have a turkey sandwich. It takes a long time to digest and my numbers always come out great the next day.
My doctor informed me that the fasting is for the cholesterol blood test and not the A1C test.

Kirla 2010-04-20 19:58:55 -0500 Report

Your liver stores glucose. If you don't eat for awhile the liver starts to dump glucose into your blood. It happens to most of us. I make my appointments for blood work early in the morning. Still fasting blood sugar is around 110 for me.

firstflight800 2010-04-20 22:43:33 -0500 Report

Thanks Kirla, I know that the liver stores glucose, but my morning numbers are usually good since a change in treatment. The little lantus shot has pretty much wiped out the "dawn phenomena". However, I did skip the metformin that morning, thinking that it wouldn't matter since I was fasting. Guess I was wrong about that, not that I am worried about the "fasting glucose", as the A1C is the one I look at more.

Harlen 2010-04-21 00:06:39 -0500 Report

yep that will do it I do my test first thing in the AM that way it comes out as what it realy is but thats just me
best wishes all

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