Normal Fasting Blood Sugar and Other Information

By MAYS Latest Reply 2015-01-21 04:08:39 -0600
Started 2012-07-12 09:57:33 -0500

Normal Fasting Blood Sugar:

A normal fasting blood sugar (which is also the blood sugar a normal person will see right before a meal) is:

83 mg/dl (4.6 mmol/L) or less.

Many normal people have fasting blood sugars in the mid and high 70 mg/dl (3.9 mmol/L) range.

Though most doctors will tell you any fasting blood sugar under 100 mg/dl (5.6 mmol/L) is "normal", there are several studies that suggest that testing with a fasting blood sugar in the mid 90 mg/dl (5 mmol/L) range often predicts diabetes that is diagnosed a decade later.
Post-Meal Blood Sugar (Postprandial)
Independent of what they eat, the blood sugar of a truly normal person is:

Under 120 mg/dl (6.6 mmol/L) one or two hours after a meal.

Most normal people are under 100 mg/dl (5.5 mmol/L) two hours after eating.
A truly normal A1c is between 4.6% and 5.4%

A1cs are not as good a measure of actual blood sugar control in individuals as they are for groups. An A1c of 5.1% maps to an average blood sugar of 100 mg/dl (5.6 mmol/L) or less when group statistics are analyzed, but normal variations in how our red blood cells work make the A1cs of truly normal individuals fall into a wider range.

Some people's A1cs are always a bit higher than their measured blood sugars would predict. Some are always lower. NOTE: If you are anemic your A1c will read much lower than your actual blood sugars and the resulting A1c is not a useful gauge of your actual blood sugar control.

Heart attack risk rises in a straight line fashion as A1c rises from 4.6%.

How Blood Sugar Control Works—And How It Stops Working:


8 replies

Papanna 2015-01-21 04:08:39 -0600 Report

Diabetic normal value FBS 70 -1oo mg/dlsome of them says 80-120 as normal
for PPBS 100 -140 for normal value . Butsome of Doctors says it was not bad if PPBS or random Bloodsugar value upto 180 mg/dl for this also no complications formed . how can u clarify

RebDee 2014-12-07 00:49:41 -0600 Report

Thank you for this information on A1c, which always has me confused. My blood sugars run between 120 and 60 but my A1c is 7.4. I was told that was because I had two shots of cortisone and also because I took prednisone during the three month period that the A1c covered. Is this true?

Grandmama16 2014-09-19 01:32:18 -0500 Report

This means I'm not ever normal. I think I'll stick with the ADA figures and even then I'm out of bounds while on 2000 mgs of Metformin. But no exercise due to fibromyalgia/chronic fatigue.

theladyiscrazy 2014-02-08 12:34:19 -0600 Report

Interesting, as this contradicts both the American Diabetes Association AND the American Association of clinical Endocrinologist . ADA says a good A1C is below 7%, before meals from 70-130mg/dl, and 1-2 hours after eating should be less than 180 mg/dL. Whereas the AACE recommends and A1C below 6.5%, before meals from 80-110 mg/dL, and 2 hours after eating should be 80-140 mg?dL.

I also find it interesting that A1C is discussed as to where the numbers should be and then put out that A1C isn't an accurate measurement for individuals. Kind of seems like a waste of time to cover why A1C's in a lower range is better when it is a mute point if it isn't accurate for individuals. So, then why cover what an A1C should be?

For many, the goal is set higher because getting to 120 is still a heck of a lot better than numbers in the 300.

Coach Cheryl
Coach Cheryl 2013-05-26 12:39:23 -0500 Report

I actually disagree to a certain extent. What we as diabetics have to understand is that all our bodies are different. We can't be put into these boxes of what is right and wrong, high or low, do's and don'ts when it comes to our individual bodies. For example if I go below 100 I feel dizzy, lathargic and unwell. My ideal level is 100-110. I am healthy, I eat right and workout. What is more important than trying to fit into these boxes (within reason) is figuring out what works best for your body, what makes you feel healthy. It does require work. Tracking how things affect you, being on top of other aspects of your health, weight, spirituality, balance in life. Wellness overall. That is what we have to focus on.

sNerTs1 2013-05-14 11:47:50 -0500 Report

I agree, this is very interesting. Oh how I love to learn more every single day. Thanks for being my "teacher" today =)

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