What Is Considered Fasting?

By Young1s Latest Reply 2012-03-20 01:14:46 -0500
Started 2012-03-18 08:11:26 -0500

I'm slightly confused about what is considered a fasting BG. I know it's the first reading that you take in the morning, but when should that be? Is it the reading immediately after waking or is it still considered fasting if it's an hour or so after you wake for the day? Is there a span of time that would be too long after waking to be considered fasting? Or is it all fasting so long as you don't consume anything between the time of waking and your first reading? Sorry if this question seems elementary but I want to make sure I'm getting this right.

30 replies

jayabee52 2012-03-19 21:57:40 -0500 Report

I tend to take my BG levels after I wake up but before I eat breakfast. I usually eat breakfast about ½ hr after getting up.

flipmom 2012-03-19 20:52:50 -0500 Report

I'm confused too! I take my readings as soon as I wake up most of the time. But if I wait, my readings usually are more higher even without eating or drinking anything.

Young1s 2012-03-19 21:25:22 -0500 Report

It is confusing but it always boils down to the individual. There have been a couple of times where all I had was a cup of tea between readings and my numbers dropped.

nanaellen 2012-03-18 22:36:49 -0500 Report

Hi there! Fasting testing is as someone else said average 8 hrs no food or drink just water but my question for you is you said you were on Lantus?? I'm concerned because Lantus is like a timed released insulin that works for 24 hours and if you split that in half are you really getting the dose you need?? Lantus can be a little tricky. I have to adjust mine every now and then. I was on 50 units @ bedtime now down to 46 units. But I've been as low as 40 units @ bedtime. When my FBS #'s are getting lower than 140 I have to decrease my Lantus and if their higher that 200 I have to increase. Just a thought! Ellen :)

Young1s 2012-03-19 09:44:57 -0500 Report

I was only on 16 units a day. But I told my doctor I wanted to try half doses to see if it would help give me more consistent morning readings within normal range. So she suggested I go up to 20 units so it would be a 10/10 split. My numbers have been between 130-150 in the mornings, which isn't too much of a difference from before the change. I'm still early in this little experiment but if I start to see my numbers leaning more on the high side, I'll go back to taking the full dose in the morning.

nanaellen 2012-03-20 01:14:46 -0500 Report

Sounds like you already have a "plan"!! :) And you aound like one smart cookie! ;) It won't be long before you have it all down pat!!

Caroltoo 2012-03-19 13:05:38 -0500 Report

Because it is active for 24 hours, only the first dose is actually a half dose. From there on, you are adding a half dose to the already present half dose. I did that when I was taking Actos at first because I noticed when I came to the time when I would take a whole pill, I was always high. The 1/2 does overlap process kept me much more stable.

Young1s 2012-03-19 14:45:54 -0500 Report

That's pretty much what she told me when I told her I wanted to do the split. She wasn't really behind the idea but she's very understanding of my wanting to try it out for a while. At my appointment today though, she said if I don't see any significant change within the next week and a half or so, then I should just go back to one dose a day.

Young1s 2012-03-19 17:48:44 -0500 Report

I don't really think another week and a half is going to be enough time to judge. I think it would take at least a month to see any significant difference. Providing I continue to eat healthy and exercise regularly.

red flower lady
red flower lady 2012-03-18 14:39:36 -0500 Report

This would depend on the person. Usually it is first thing in the morning, but if you are going to the drs for it then it can be alittle longer then ideal. For me, using insulin I can't go long without taking it and eating as well. So, for this reason the drs office always has me there as soon as they open. I do take it at home and then show them my reading to compare it.

Good question!!!

Young1s 2012-03-18 14:52:48 -0500 Report

Thanks Red. Taking my insulin is the other thing I guess I'm trying to figure out as well. I always take my Lantus within seconds of checking my BG but don't always eat right after doing that.

red flower lady
red flower lady 2012-03-18 15:00:49 -0500 Report

You take your Lantus in the am, I'm guessing. I had to take it at bedtime, per dr or it didn't work right for me, then my other insulin throughout the day. Do you only do Lantus? You don't have to eat right after taking it as it is a 24 hr insulin, but do need to eat your regular meals.

Young1s 2012-03-18 15:12:46 -0500 Report

Yes and it's the only med I am on besides vitamins and supplements. I've been experimenting with splitting it in half the past couple of days but haven't been doing it long enough to say if it's working or not. But I do try to take it and eat throughout the day on a set schedule.

red flower lady
red flower lady 2012-03-19 10:31:50 -0500 Report

Ask your dr if you can take half at night and the other half in the morning. This is how a friend takes hers. Do you take the other half at all? You may have to take all of it at night like I did, but remember I also do other insulin as well.

Young1s 2012-03-19 10:35:53 -0500 Report

I'm doing a split of 10 units in the morning and in the evening. Still early to tell if it's helping but I'm hopeful. See my reply to Nanaellen above this.

Type1Lou 2012-03-18 12:29:09 -0500 Report

I consider a "fasting" BG to be one where I haven't eaten for 8 hours or more. Usually, it's the first one in the morning when I wake up but if I have to have blood drawn and I don't get there (for whatever reason) until 3 hours after I rise, as long as I haven't eaten anything, it's still "fasting". Interesting to consider, though, whether there would be any significant variation in BG levels between the 1st "fasting" and one taken 3 hours later without having eaten. I might even consider that the one taken 3 hours after rising might be lower…? Good question!

Caliafiosgram62 2012-03-19 18:09:22 -0500 Report

I've done that - depending on what time I get up - during the week at about 5:30 - and then at 8:30 if I've had blood drawn on that day and have to wait - the numbers are always different. For me, as time goes on in the morning, my numbers go up until around 9:00 no matter if I'm fasting or not. I am the "dawn factor" personified. Since I'm usually testing before dawn :) …

I can go up as many as 20 points between 5:30 and 7:30.

I don't know if it makes any difference that I'm type 1 - maybe…

Young1s 2012-03-18 14:46:23 -0500 Report

Thank you Lou and I would say that's a yes to your question. There have been a couple of mornings where I've taken my morning BG, only had a cup of tea, and 2 1/2 - 3 hours later it's around 20 points lower. (Sorry, had to edit, must have been rushing out the door when I was typing this.)

BobbieNJ1000 2012-03-18 13:39:00 -0500 Report

As we discussed in another post, mine is higher 3 hours after rising if I haven't eaten. Must change insulin dosing…

jigsaw 2012-03-18 10:07:53 -0500 Report

For blood tests with lab results, they usually request a minimum of eight hours of no food. After 8 hours, apparently any affects of previously eaten foods will not throw off the results.

Young1s 2012-03-18 14:40:04 -0500 Report

Okay, so if I've had a before bed snack and only had 6 hours of sleep, you're saying that it would be best to wait a couple more hours before testing to hit my baseline low (for lack of a better way of saying that).

jigsaw 2012-03-18 15:47:29 -0500 Report

There are some variables, but if you're testing for bg or cholesterol, as a rule of thumb, 8 hrs is a safe bet. So yes, for the sake of accuracy, I would wait 2 more hours.

Caroltoo 2012-03-18 09:56:18 -0500 Report

I do mine before my feet hit the floor in the morning because I feel I get a more accurate reading of what my body is doing w/out conscious thought — what the forces of the autonomic nervous systems have done during my sleep/rest time to rejuvenate my body — and before the problems/stresses of the day affect my BG.

Technically, I guess it is the first reading of the morning taken preprandially just before breakfast. I just use it to look at other things for my own purposes.

If I were usuing insulin, then I suspect this would have to be done just before breakfast.

I think you will get a wide range of answers depending on how the individual uses the reading and all will think it is the correct way (and for them, it will be).

KarynCandy29 2012-03-18 14:47:34 -0500 Report

I must say your comment intrigues me,I never that of testing before getting out of bed..I wonder if anyone else here does that as well..I wonder if there is a differences…hummmmm..you've got me thinking..

Caroltoo 2012-03-18 19:44:25 -0500 Report

Probably depends on what you do between awakening and eating. If it is stressful it could raise your BG; if it is active, it could lower them. I know that mine will drop after breakfast because I eat a high protein breakfast, so my interest is more to see what has been happening with me overnight. I'm also not using any medication so don't have to do a true preprandial for an insulin shot.

Young1s 2012-03-18 14:33:55 -0500 Report

This is why I ask because sometimes there are hours that go by between waking and my first reading. I'm just wondering if I'm doing myself a disservice by not testing earlier? Not matter what the time span is though, the only thing I will have is water until I can do my morning check.

Caroltoo 2012-03-18 19:41:35 -0500 Report

You take insulin in the morning, so I'd think you are safer with a reading just before you inject. That way you know it tells where you are right now. Test both times for a couple days and see what consistency there is between an early test and one right before your meal. If meal prep and kid's routine's create stress, you preprandial could be higher than one that is taken upon awakening.

Young1s 2012-03-19 08:52:26 -0500 Report

You've given me something to think about. Between 5:30am and 7am I'm in the midst of getting my youngest two up and out for school and it's almost always a struggle with my son. Not a morning person at all. But by 7:30am my nerves have settled and I start my morning routine. It's definitely worth checking out for a few days to see if there is a difference in my levels.

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