Lowest ever, probably 28.
I had a 36 last night. Middle of night. Luckily I woke up. I was completely lucid and only had that tingly sensation on my tongue…like what I used to get at 65.
Scary. Other times I act like a freaking lunatic, double vison, rapping, ranting etc…
I don;t get it.
Highest…hmmmnot sure. Certainly over 500. very rare it goes that high. That was unusual.
I really need to investigate CGMS before I end up dead. 
I just have a question…so is it rare to have it drop too low? My boyfriend was diagnosed just 12/26 and I keep getting terrified it will go too low but recently it keeps hovering around 200. He is trying to keep it lower…ugh, I get so confused by it all. I’m quite intelligent and read plenty but putting it all into practice with his meals…baffles me.
800 (in diabetic ketoacidosis one year ago)
37 - not fun
Normal range is somewhere between 70-120 (this range can vary slightly depending on who you talk to, but I would say 70 is the lowest normal and 120 is the highest).
A blood sugar of 200 would be considered high.
Unfortunately (?) it is not immediately life threatening though. I say “unfortunately” because that makes it easier to ignore. You could theoretically go years with a blood sugar as high as 200 without ever knowing. It would cause damage to your organs and stuff overtime, and that would be bad*. (*Bad like my parent’s friend who is diabetic and ignored his blood sugar for years and is now 1 leg lighter and has a freshly installed kidney from a car accident victim! lucky him. Seriously, he is not at all happy with his life choices at the moment. He ate cookies everyday for like 15 years and completely ignored his sugar. He felt “fine”."
The danger most of us who use insulin face is OVER COMPENSATING with TOO MUCH insulin.
Basically, the way I think about it, when a normal person eats, the body releases an appropriate amount of insulin to handle the carbs in the food. It releases just enough insulin to get the Blood Sugar (that was converted from the carbs eaten) to the cells for energy, but leaving enough in the blood (somewhere between 70 and 120) so things like your brain can function.
So if you go low, too low, you can pass out have a seizure, have a Steel Magnolias episode, pee your pants, see double, die, act like a damn fool, go into a coma, walk around your yard naked (I think I did that once), crash your car, not be able to add 2+2, make sense of simple things, get really, really agitated, etc…
Basically, act like your drunk without the fun. And possibly dying.
Those of us who have been around the block start experiencing these symptoms at lower levels. The body gets desensitized to it somehow. Sounds like a good thing but it isn’t really, since it means we don’t know we are close to death until we reach 28 instead of getting alerted at like 65.
Is it rare? no.
Is it dangerous? Yes, it can be.
Should you be afraid? Not if you are careful.
Am I being dramatic? Maybe a tad, but only a tad.
Test often (7-10x day)
get a pump (if you can afford it through insurance).
Learn to count carbs and learn you insulin-to-carb-ratio.
I have only been on a pump for 2 years (Jan 2007). I have been insulin dependent since 1987. I was 17 when I got it.
I have:
*seen double
*acted like an idiot
*had a seizure, peed my pants, foamed at the mouth and dislocated my right shoulder (from the seizure) in front of my wife’s family. Easter Dinner. I can laugh about it now…but HOLY CRAP!
*tried and failed to use an ATM machine to get moiney to buy a snickers bar because I couldn;t remeber how to use it.
*passed out at work and had 911 called for me
*almost crashed my car (guard rail woke me up as I started scraping against it)
Those are the Low-Lights. (vs high lights)
I was uneducated.
If he is on a pump, get the book “Pumping Insulin”. It’s great resource. If he is only taking shots, I would HIGHLY recommend getting a pump. Highly, highly, highly.
Hope I am not freaking you out. 
On a very serious note (another one), your bf’s life is certainly not over by any means. I live a very full life and am very active. I do a lot of construction type stuff at my home, am very healthy in spite of diabetes, did karate for many years, etc…
I jut have to be more careful in the things I choose to do and how I do them.
i live in england so the lowest would be about 1.5 and the highest would be over 33.3
My highest was HI (over 600 <–?) and that was being lazy and not taking my insulin. I was diagnosed with my sugar at 442. My lowest was 24 and I fell down my stairs. My boyfriend came running out of our room and down the stairs to get me. Luckily I wasn’t hurt and still conscious and he forced a full soda (can approx 46 carbs) down. I checked my sugar about 20 minutes later and it was only 38. Then there are other times when I’ll over compensate the carbs for a low and my sugar will shoot up (like it is supposed to). But those couple of times where I’ve been really low and didn’t do 15 g carbs (did way more) and my sugar barely moved… gets me confused for the other times.
Highest 568 was able to take care of it at home, was 790 at the hospital 8 years ago. Lowest 20 while driving, told my kids if I had to pull over that someone might come to the door, just tell them I need sugar or call 911, the one day I did not have my cell, made it to a drive thru and ordered a coke. 16 when my daughter had to call 911.
I am a T2 (no meds or insulin) and sometimes I go as low as 67, as I did this evening before dinner. I cannot tell I am going low unless it is during the early morning hours from about 2 am to 5am. If I am up and about I do not get any indicators. My highest was 1200 when I was diagnosed several years ago.
Jim
Sushi is my weakness. Why does white rice have to be so bad for you. I just found sushi a few years before being diagnosed. My sugars always hit the 200’s after sushi. Well, something has got to kill us.
Highest>550
Lowest> 21 and that was in a supermarket aisle! I was able to get some gluc tabs out of my purse but i was really moving slow…scary
Low of 3.9 (70), high 12.5 (225). I only ever got the low reading once. The high I can hit by eating something carby.
Dear Erik. That is great you are obviously not on insulin. If you were you could do better on the after meal highs but possibly at the expense of weight gain. This way you have a good reason not to eat anything carby.
High—WAYY HIGH-in teens was 13% or more in HGA1C’s. I think.
Low—walked down 15 stairs, stumbling, bumped into 3 walls, took over 10 mins to test, then was 26. I laughed. Obviously I overate.
Also had Ambulance called and they gluco-ized me. Even asked who the President was. My husband told the 911 operator that I wan’t waking up and had to get me dressed, so he hung up on her. Had fire, EMT’s and police there. Wish I remember. I do remember going to bed naked and waking up with clothes on backwards though!!
Highest…over 800 HIGH
lowest…26
My highest was 232 (12.8)…my lowest 27(1.5)…not on insulin
lowest far as I Know is 69, highest has been 200
Highest was in the hospital ICU: 737 (initial diagnosis)… lowest has been last week: 45.
lowest on sunday 59 then after eating jumped to 160something
Man, those wild swings feel like someone sucked the stuffing out of you with a vacuum cleaner!