Blood Sugar/Glucose Levels [MUST READ first post]

Just got back from my blood draw. Looking at the results, my glucose is sitting at 3.7, while the standard range is supposed to be between 3.9 and 5.9 mmol/L.
I had the labs done around 10:30 AM.
About an hour before that, around 9:30, I had a Starbucks with two packets of sugar—just your standard cafe sugar—and yet my levels are still coming back low.

I’m wondering how much a cappuccino could have actually bumped my numbers. I’d also finished a swimming workout about two hours prior, from 7:00 to 9:00.

Please keep discussions focused on blood glucose levels (BGL) here. For anything regarding diabetes, medication, or treatments, please move those questions over to this thread: Diabetes. Thanks. 🙂

leeloo27

Justin Jackson55 said:I just got my blood work back, and my glucose came in at 3.7, even though the normal range is 3.9 to 5.9 mmol/L.
I went in for the draw around 10:30 AM.
About an hour before that, I had a Starbucks with two packets of sugar (just standard stuff you get at a cafe), and my levels are still coming up low.

I'm wondering how much that cappuccino could have bumped my sugar up? Right before that, I was swimming for two hours from 7:00 to 9:00.

Why would you drink anything besides water before a blood test? 😕

You're supposed to be fasting, I don't know what else to tell you...

Jumping in here on this topic.
I’m actually curious about how much blood sugar can spike after a meal... My fasting levels are borderline low (at least that was the case last time I had labs done at the clinic). Today, right after lunch and dessert, I used my father-in-law's glucose monitor and it read 4.7 mmol/L... I’m trying to figure out what the typical rise is after eating, just to estimate what my actual fasting level might have been.😁
Honestly, I can't function without something sweet. If I don't grab a treat, I start feeling lightheaded and just generally off.
Best, thanks.🙂

redpilot37 said:Just wanted to jump in here.
I was wondering how much blood sugar usually spikes after eating... I tend to have pretty low fasting levels—at least that’s what my last lab test showed—and I checked right after lunch and dessert using my father-in-law's glucose meter today, and it read 4.7 mmol/L... I'm just curious about how much it typically rises after a meal, so maybe I can figure out what my actual fasting level might be.😁
Honestly, I can't go without something sweet; I start feeling lightheaded and just off if I don't grab a little treat.
Best, and thanks!🙂

For healthy people, normal blood sugar levels usually sit somewhere between 3 and 6 mmol/L. Since yours was 4.7 after eating, that seems perfectly fine.
In a healthy person, you shouldn't see a massive spike in glucose after a meal, mostly because insulin and counter-regulatory hormones work together to keep things steady...

Sarah Taylor14 said:Standard blood sugar levels for healthy people usually sit between 70 and 110 mg/dL. Yours was at 85 after eating, which is perfectly fine.
In a healthy body, you don't see massive glucose spikes after a meal because insulin and counter-regulatory hormones stay in balance...

That's what I wanted to know.
Thanks.🙂

So here’s the deal:
I’m 20 years old.
I went in for some blood work because I was worried about maybe having diabetes.
Before the draw, I actually ate a massive breakfast since I had no clue you were supposed to fast first.
After they took my blood, my sugar level came back at 108 mg/dL.
Two days later, I swung back by for more detailed testing, this time on an empty stomach. But when I mentioned to the nurse that I'd eaten before the first test, she told me I didn't even need the full panel anymore, so we just stuck to the basic blood draw.

That time, the reading was 90 mg/dL.

I hit the gym pretty hard and load up on carbs whenever I can because the goal is strictly muscle mass.
Mostly I’m talking potatoes, brown rice, but I eat a ton of bread too.
It’s not like cheap white bread—it's usually decent rye or whole grain stuff.

I’m wondering if it’s actually smart to be slamming so many carbs given that my sugar levels have been a bit high.
I stay away from anything sugary, except for fruit.
My numbers definitely spike right up to that borderline range after I eat, which is what’s got me tripping out.
I haven't really gained any weight or anything.
Honestly, I think the stress might be the culprit, because a few months ago I was dealing with some brutal insomnia while trying to grind through finals at college.

If anyone who actually knows their stuff could weigh in, I’d appreciate it.

thanks!

Who on earth told you that your blood sugar was elevated?
Your lab results look perfectly normal to me, I guess.

Casey Phillips18 said:Wait, who even told you your blood sugar was high?
Your labs look totally fine to me.

The doctor.
I mean, she wouldn't just send me in for some random diabetes screening for no reason.
It’s probably one of those things where they draw blood, then I have to sit there for like two or three hours, and then they hit me with the glucose shot to see how my body reacts.
Something like that. 🤷

I've heard about that screening process—basically, if you aren't diabetic but they suspect something might be up, they give you some kind of high-sugar drink or whatever and just monitor how your body reacts... maybe ask your doctor for more specifics on how that works.

Jamie James3 said:I went in for blood work because I was worried about potential diabetes.
Since I didn't realize I needed to fast beforehand, I had a massive breakfast right before the draw.
After the blood was taken, my glucose level was 6 mmol/L.

That is a perfectly normal sugar reading... considering at least 1-2 hours passed between that heavy breakfast and the actual blood draw.
There is no reason to worry—this result is fine.

Jamie James3 said:Two days later, I returned for a more detailed screening on an empty stomach.
The level after that draw was 5 mmol/L.

Another textbook result.

Jamie James3 said:I am wondering if it is wise to consume many carbohydrates given my elevated sugar levels.

Your sugar isn't elevated...

Jamie James3 said:Clearly, my levels spike to that borderline range after eating, which concerns me.

This happens to all healthy individuals.

Jamie James3 said:It was a doctor.
I assume she wouldn't send me for diabetes testing without cause.
I expect they will draw blood, have me sit for two or three hours, and then administer glucose to see how the body reacts.
Something like that. 🤷

The test is called an OGTT—it involves a glucose load followed by multiple blood draws at specific intervals to monitor the response.
I am confident that everything will resolve itself following this investigation.

Jamie James3 said:It’s a doctor.
I suppose they wouldn't be sending me in for some random diabetes screening without reason.
They'll likely draw some blood, then I'll probably have to sit there for two or three hours before they administer the glucose to see how my body reacts.
Something along those lines, I guess. 🤷

Glucose levels are always checked on an empty stomach.
Normal fasting values generally fall somewhere between 54 and 108 mg/dL, while post-meal levels shouldn't exceed about 140 mg/dL. Based on that, both of your results seem to fall within the acceptable range.

Aha, gotcha. Fair enough.
Plus, they told me I don't even need to bother with any more follow-up tests.

I'm just wondering, though—is it actually an issue if my blood sugar spikes more often during the day? Like, if I'm eating five times a day instead of three, is that gonna totally mess up my insulin response?

Is it totally normal to hit hypoglycemia like 2-3 hours after eating?
Also—if I don't grab a snack right before hitting the sack, I’ll wake up in the middle of the night with my sugar crashing.
My levels are usually fine otherwise.🤷
I've also noticed that whenever I'm stressed out, my blood sugar tanks super fast and I just get hit with this massive hunger.

I mean... there’s already a thread for diabetes, so why bother starting a whole new one? 🙄

How many units of insulin are you taking? You really should probably scale back.

And regarding the anxiety—I heard that stress can spike your blood sugar, though sometimes it actually makes it drop.

Moderators, please feel free to move this thread if you think it belongs elsewhere.
So, I undergo a routine wellness checkup at work every single year... and up until now, my blood work has always been fine, aside from some slightly elevated triglycerides (2.1) and high uric acid—though, to be fair, everyone in my family deals with that.
But this year, my glucose came back low, at 3.66.
In previous years, we went to the Mayo Clinic where the doctor took the time to explain everything clearly, but this time we used a different clinic where the internist barely said more than a couple of words before dismissing us.
Should I be concerned about this low blood sugar level?

rustymason82 said:First off, mods, feel free to move this thread if you think it belongs somewhere else.
So, basically, we do these annual physicals at work... and up until now, my blood work has always been pretty solid, aside from maybe slightly elevated triglycerides (around 2.1) and high uric acid, but honestly, everyone in my family deals with that.
But this year, my glucose came back low—3.66.
In previous years, we used to go to the Mayo Clinic where the doctor would actually sit down and walk you through everything, but this time we went to some other clinic where the internist barely even mumbled a few words before brushing us off.
Should I be worried about this low blood sugar?

Well, it’s not actually that low if they took the sample while you were fasting (which is almost certainly what happened here).☕

Basically, you always have to take things with a grain of salt when looking at lab results, since some labs set their lower limit right at 3.5.

Every single lab has its own specific reference range—it's all calibrated based on whatever tech they're using to run the tests.

If you remember the good old Gauss and his bell curve, you'll see you're just hanging out on the far left edge of that "hat," which really just means the value is perfectly fine.👍

Roughly speaking—there's no reason to stress about that number right now.
Especially if you aren't feeling crappy.
If you want total peace of mind, you could always just go get an OGTT (that oral glucose tolerance test).
It tastes absolutely terrible, but it gets the job done.😁

Thanks for clearing that up 👍

Mine was sitting right around 4, maybe even a hair under—though I think 4 was the cutoff—so they sent me in for an OGTT. Turns out my insulin levels were through the roof.

You dealing with any other health stuff or weird symptoms lately?

Emily Patel70 said:My numbers were sitting right around 4, maybe even just under it—though I think the cutoff was 4—so they sent me in for an oral glucose tolerance test. Turns out my insulin levels were through the roof.

Are you dealing with any other health stuff or noticing anything weird happening with your body?

That’s one scenario we really need to be prepared for 🕺

But seriously, you’ve always got to keep a close eye on how you're feeling—like if your balance feels off or if your usual condition starts shifting—and make sure to act fast when something's up. 👍

I don't have any other symptoms. Honestly, I’m a bit skeptical about the results since my sister had such a hard time getting even a basic blood draw done at that clinic after four attempts. Plus, her glucose levels were perfectly fine every single year leading up to this, so I’m not overly worried. We’ll just have to see what my sugar levels look like next year 😁. If they come back too low then, I'll definitely seek a second opinion
.