Back to Ask the Diabetes Team Ask the Diabetes Team

From New York, USA:

I have a different glucose monitor than my brother-in-law and have been using both. However, my monitor always reads 16-20 mg/dl [0.8-1.1 mmol/L] points higher than my brother-in-law's. When mine reads 93 mg/dl [5.3 mmol/L] (normal), his reads 77 mg/dl [4.3 mmol/L] (low). How do I know which is correct?


Both of the meters you named give plasma results, not whole blood, so that should result in values should be within about 10% of each other. Your differences are about 16% or more, which might be due to a problem with the meter or problem with using the meter. I assume the correct technique is being followed with each meter and the strips are not expired. Also, I hope one of the meters has not sat in a hot car for a while.

There could actually be many reasons for the variations, so I would suggest you take both of the machines into your diabetes educator's office and discuss this with him/her. I certainly understand your concern.


Original posting 29 Jul 2002
Posted to Blood Tests and Insulin Injections


  Back to Ask the Diabetes Team Return to Top

Last Updated: Tuesday April 06, 2010 15:09:36
This Internet site provides information of a general nature and is designed for educational purposes only. If you have any concerns about your own health or the health of your child, you should always consult with a physician or other health care professional.

This site is published by T-1 Today, Inc. (d/b/a Children with Diabetes), a 501c3 not-for-profit organization, which is responsible for its contents. Our mission is to provide education and support to families living with type 1 diabetes.
By using this site, you agree to our Terms of Use, Legal Notice, and Privacy Policy.
© Children with Diabetes, Inc. 1995-2018. Comments and Feedback.