Fasting for blood sugar test.

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Date Joined Oct 2009
Total Posts : 291
   Posted 4/7/2010 6:47 AM (GMT -7)   
Hi everyone. I don't usually post here, but I've got an important question. I had some blood tests done, and they called and told me the tests were normal. about a week later, I went went in for a different problem. The doc says that he was looking at the test results and said my blood sugar was elevated. I told him that the test was taken in the evening so I didn't fast, because they weren't checking my blood sugar. So, he told me that he wanted to check it again but to fast this time. The doc told me that I could drink coffee, but to only drink it black. Well, my blood sugar was 132. So, he prescribed Metformin.

My question is, is it ok to drink coffee before? I googled, and it says to not drink anything but water. Is that true?

Lanie G
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Date Joined Nov 2006
Total Posts : 6026
   Posted 4/7/2010 7:30 AM (GMT -7)   
I've never heard of a lab or doctor saying it's ok to drink coffee before a fasting blood test.  In fact, some people say that caffeine actually will raise their blood sugar.  And I also question the decision to put you on a medication from that fasting test.  If I were you, I'd have a talk with the doctor and request another test.  (I'm not a doctor, mind you, but this seems very irregular in my opinion.)  A random blood test might indeed show an elevated blood sugar but there may be other factors that caused it, not diabetes.  Normally, a doctor will order a fasting on more than one occasion and along with the fasting report, he would have an A1c reading which will tell you what your average blood sugar was during the past 3 months.  I would not rule out that you do have some pre-diabetes tendency but it might be able to be controlled by diet and exercise at first, so if it were me, I'd go back and talk to the doctor.
forum moderator - diabetes
diabetes controlled so far by exercise and a low/no carb diet

Regular Member

Date Joined Oct 2009
Total Posts : 291
   Posted 4/7/2010 7:33 AM (GMT -7)   
Lanie, I plan on asking them to do the test again. This time I won't drink anything but water. Thanks for your reply! And, I'm going to wait to start the medicine.
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