Can blood draw earlier in the day affect blood glucose later in day?

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Can blood draw earlier in the day affect blood glucose later in day?


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Old 08-17-2016, 05:58   #1
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Default Can blood draw earlier in the day affect blood glucose later in day?

Hello

Just curious. Had like ten vials or something of blood taken for some labwork this morning.

Can having a lot of blood taken in the morning affect blood glucose levels later in the day?

Thanks

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Old 08-17-2016, 07:29   #2
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Maybe, but unlikely. I suppose if they took a lot of blood. People who donate blood are given sugar carbs afterwards to give them a boost. But they just gave a whole pint of blood.

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Old 08-17-2016, 07:32   #3
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This is your third post on this topic. I think you are over analyzing your BG numbers. Just focus on your morning fasting, your before meals and your 1-2 post meal numbers.

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Old 08-17-2016, 15:38   #4
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Hello

I'm not so much worried about those numbers but was more curious in general.

Just curious if anyone has noticed any correlation between getting blood work earlier in the day and numbers later in the day.

I am an over analyzer. . Always have been but not in a worrying kind of way. I just like to know what I'm dealing with and want to know for future reference too when I get blood work what to expect.

Thanks guys!

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Old 08-17-2016, 16:22   #5
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Most of who are managing our blood sugar by a change in diet (low carb) and frequent testing rely more on our daily tests rather than periodic lab tests which only give minimal information. The A1C, being an average, doesn't tell the whole story about day-in-day-out BG levels.

So... have you begun to count carbs and test like we have been suggesting? These are the numbers that tell you how you're doing.

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Old 08-17-2016, 16:46   #6
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The lab work I had done was actually something completely different and did not test my A1C. It had nothing to do with diabetes testing at all. It was for hormonal stuff. I was just wondering if having a done of blood taken earlier in a day can affect blood sugar later (in either direction).

I have cut out all excess sugar since I got my diagnoses of pre diabetes a few weeks ago and have been eating very small amounts of carbs and upped my protein since then as well. I eat a very small piece of multigrain bread for breakfast or very small bowl of cereal. For lunch or dinner the smallest amount of rice, pasta etc. Just the last day or so I started doing more glucose testing but I'm now doing more aggressively to get a better picture.

DId it this morning upon waking. 86. And test again this morning one hour after first bite of breakfast. I'm going to do the same thing after lunch. This way I can get a bigger picture how the carbs I eat affect my blood glucose.

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Old 08-17-2016, 17:20   #7
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Be sure you count the grams of carbohydrates with each meal. Eventually, you will be able to predict how high X amount of carbs will raise your blood sugar. Once you know what your carb limit is to prevent a BG rise above your goal (mine is 120 but in any case should not be above 140) - then you won't need to test so often. But you need to know exactly how many carbs you are eating.

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Old 08-17-2016, 21:15   #8
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Quote:
Originally Posted by midoritori2016 View Post
Just curious. Had like ten vials or something of blood taken for some lab work this morning. Can having a lot of blood taken in the morning affect blood glucose levels later in the day?
Not much happens after a blood draw unless it's a large donation. By large I mean a pint (473 ml) or more. Your typical vial will range anywhere from 3ml to 10ml or 3cc to 10cc's. So, let's say it was the 10ml. That's 10x10ml...or 100ml, or 21% of a pint.

In a large blood draw the body goes to work right away replacing that blood using a secreted protein called erythropoietin...which, during a BG test...does not effect the value.

Any process the body takes on requires energy. It's the old 'you don't get something for nothing' rule. Therefore...we get our energy from glucose. Would that glucose be enough to move your curiosity meter a few points either way? Probably not.

There's about 5,678ml of blood in your body. 100ml is 1.7% of that. Not really enough loss to get your body's full attention...in my opinion.

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Old 08-18-2016, 04:46   #9
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Quote:
Originally Posted by midoritori2016 View Post
Hello

Just curious. Had like ten vials or something of blood taken for some labwork this morning.

Can having a lot of blood taken in the morning affect blood glucose levels later in the day?

Thanks
10 vials is virtually nothing. There is very little blood in those vials. It just seems like a lot to you. If you donate blood regularly, as I do, you would see how little it is.

The cookies and juice you get after donating blood are just a reward for coming and because many people have delayed a meal (after work) to come to donate. For some people, donating blood makes them woozy and sick to their stomach and the glucose in these can help.

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Old 08-18-2016, 21:13   #10
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Agree with the others, and can provide Sample Size #1 testimonial:

I have regular bloodwork (12 vials or so) and have never seen any impact on my blood glucose readings.

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