From New York, USA:
My daughter is now 17 and has given blood twice. Unless I'm mistaken, she is going to lose some of the hemoglobin upon which the A1C would be based (3 month intervals).
How will donating blood twice, 56 days apart, affect a hemoglobin A1C drawn every 90 days?
I'd need some more information, for example her weight, in order to roughly estimate blood volume, the timing of the two blood draws in relation to the A1c test and whether blood has been given more than twice in the last few months, etc., to come up with anything better than an approximation as to the effect on the A1c. This understood, the maximum change would be a few days after giving blood when the blood volume would be restored but not yet the normal cell content. Any reduction should be less than 10%; but this would not be easy to interpret because the 95% confidence limits of many of the glycohemoglobin assays are themselves +/- 10%. If you are concerned, it might be an idea to skip the A1c until an office visit that is some three months after the last blood donation and just use blood sugars to judge control.
Original posting 29 Sep 1998
Posted to A1c, Glycohemoglobin, HgbA1c
|Return to the Top of This Page|
Last Updated: Tuesday April 06, 2010 15:09:00
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.
© Children with Diabetes, Inc. 1995-2018. Comments and Feedback.