Endocrinology (including Diabetes)/Should I be worry



I have had several FBS tests done in the pervious years and they range from 95 to 109. My most recent FBS tests shows 75, 107, 103, 95.

I have also done HbA1C twice and the readings came 5.2 and 5.6.
I have notice that my FBS is high (from 95-105) in the morning and it goes back to 80's or 90's during the course of the day after having my normal meals and conduct my normal activities.

Once i had my lab tested my FBS and it was 108 then i re tested 2 hrs after taking my breakfast and the reading was 91.

Is that blood sugar reading of mine are normal? Should i take any any actions to correct possible issues? What is more accuret FBS or HbA1C?

What is IFG (impaired fasting glucose), and do i have this by understanding my readings up?


  According to standards set by the American Diabetes Association, you can use either fasting blood glucose or A1C values to diagnose diabetes and prediabetes.  A couple of your FBG values are in a prediabetic range (defined as 100-125 mg/dl), but your A1C is below prediabetes (set as 5.7-6.4%).  The reason your morning values are higher than post-meal is that insulin resistance is highest in most people first thing in the morning, but as soon as you eat and "break" your fast, the levels of glucose-raising hormones like cortisol that are higher overnight drop, insulin is released, and your BG is back in a normal range.
  There may be a few things to try to reduce your morning fasting levels.  Regular physical activity is one thing that can help.  Also, moderating your carbohydrate and calorie intake can also impact it. Getting adequate sleep is also important as physical and mental stress can raise your cortisol levels. For some, having one alcoholic drink in the evenings lowers their morning fasting levels as well.  It is definitely something to monitor, but simply living a healthy lifestyle will help keep you from developing prediabetes and/or diabetes.  I have more information and tips on my web site at www.shericolberg.com that may help you make healthy lifestyle changes.  Sheri

---------- FOLLOW-UP ----------

QUESTION: Thanks a lot for the info....
Can I rely on my normal A1C normal tests?
Does smoking play any role on BS?
How frequent should I test my BS?
Are home blood sugar monitors accuret or should I preform the test in a medical lab?


  Normal A1C values are fine to rely on, assuming that you have them done in a lab at least once a year.  Smoking does increase BG levels and causes insulin resistance, so it is best avoided if you want to prevent diabetes.  Since your BG levels are mostly normal, you really don't need to test them unless you have symptoms that you want to confirm aren't caused by elevations in BG. If you want to test your own occasionally, though, a home meter is fine.  Don't try to diagnose yourself with prediabetes or diabetes without getting an actual lab test done, though, as meters can be somewhat inaccurate.  Sheri  

Endocrinology (including Diabetes)

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Sheri Colberg, PhD


I am an exercise physiologist with a PhD who specializes in diabetes--as such I CANNOT answer general questions about other endocrine problems as I am neither an expert in all areas of endocrinology nor am I a medical doctor. My expertise lies in answering questions about diabetes (of any type) and physical activity, so please limit your questions to those areas. I can help you if you want to begin exercise or if you're already a diabetic athlete, and I am prepared to respond to questions about physical activity to which even your diabetologist may not know the answer. I can give suggestions about changes in your diabetic medications that differing types and intensities of exercise may necessitate, but I will have to refer you to your regular health care team to get final approval to make such changes. I can also answer questions about physical fitness, exercise metabolism, prediabetes reversal, and prevention of type 2 diabetes and diabetic complications.


I have both personal and professional experience in the areas of diabetes and exercise/physical activity. On a personal level, I have had type 1 diabetes since 1968, and I have been an avid exerciser since I was a child. Professionally, I have been conducting clinical studies on diabetes and exercise since 1992, largely with funding from the American Diabetes Association. I am also the author of 8 books related to diabetes, exercise, and more: The Diabetic Athlete (2001), Diabetes-Free Kids (2005), The 7 Step Diabetes Fitness Plan (2006), 50 Secrets of the Longest Living People with Diabetes (2007), The Science of Staying Young (2007), Matt Hoover's Guide to Life, Love, and Losing Weight (2008), Diabetic Athlete's Handbook (2009), and Diabetes? No Problema! (2009).

I am a Fellow of the American College of Sports Medicine, a professional member of the American Diabetes Association (and professional volunteer for the ADA), and a former member of the Board of Directors of the Diabetes Exercise & Sports Association.

I have published research and review articles in the following journals and magazines: Diabetes Care, Diabetes, Journal of Diabetes & Its Complications, Diabetes Self-Management, Medicine & Science in Sports & Exercise, Journal of Applied Physiology, The Physician and Sportsmedicine, Journal of Clinical Investigation, International Journal of Obesity, FASEB Journal, The Diabetes Educator, Journal of Physical Education, Recreation, and Dance, Clinical Exercise Physiology, Clinical Diabetes Reviews, Insulin, ACSM's Health & Fitness Journal, Biomechanics, On the Cutting Edge, Diabetes Technology & Therapeutics, Microvascular Research, Drug Benefit Trends, ACSM Certified News, Diabetes Health, SportEX Health, Diabetes Focus, Diabetes In Control, dLife-For Your Diabetes Life, Pediatrics for Parents, and My TCOYD (Taking Control of Your Diabetes) Newsletter. I have also been interviewed in myriad other magazines, such as Men's Health, Men's Fitness, Diabetes Forecast, Countdown Magazine, Joe Weider's Muscle & Fitness, Health, Tidewater Parent, Barron's News, Diabetes New Day, and Newsweek International.

I have an undergraduate degree (1985) from Stanford University, a Master's degree in exercise physiology (1987) from the University of California, Davis, and a Ph.D. (1992) from the University of California, Berkeley, in the same field. I also spent two years in an NIH-funded postdoctoral research position in endocrinology (studying obesity, diabetes, metabolism, and exercise) at the University of Pittsburgh School of Medicine (1993-1994).

Awards and Honors
Fellow, American College of Sports Medicine (FACSM) - 1996 Old Dominion University Darden College of Education Young Investigator Grant Award 2003 Honor Society of Phi Kappa Phi, Old Dominion University Chapter 2004-Present Great Women of the 21st Century by the American Biographical Institute 2005 Edition Old Dominion University Darden College of Education Largest Research Grant Award 2006 Old Dominion University Darden College of Education Publications Award (for greatest number) 2006 Saint Louis University, The Max K. Horwitt Memorial Lecture Distinguished Lectureship Award 2008 Old Dominion University Darden College of Education Publications Award 2009 Old Dominion University Darden College of Research Grants Award 2009

Past/Present Clients
I have consulted for numerous groups, including Can-Am Care, Numera|Social, California Commission on Peace Officer Standards and Training(about candidates with diabetes), Animas Corporation (an insulin pump company), Therasense, Inc. (makers of the Freestyle blood glucose meters), Council of Healthcare Advisors, and the City of Chesapeake (Virginia) Health Department.

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