# How Glycemic Variability impacts HbA1c

**URL:** <https://forum.fudiabetes.org/t/how-glycemic-variability-impacts-hba1c/5223>\
**Category:** Treatment\
**Tags:** a1c, glycemic-variability\
**Created:** [October 15, 2018, 11:14pm UTC](https://forum.fudiabetes.org/t/how-glycemic-variability-impacts-hba1c/5223 "2018-10-15T23:14:09Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![oni](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/oni/32/4872_2.png) [@oni](https://forum.fudiabetes.org/u/oni)\
**Post date:** [October 15, 2018, 11:24pm UTC](https://forum.fudiabetes.org/t/how-glycemic-variability-impacts-hba1c/5223/13 "2018-10-15T23:24:20Z")

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@Jen you are right, there are multiple causes of a1c variation. I am just trying to see if glucose variability is a significant cause of that variation. It is assumed GV is bad because of extra glycation, without much proof. (And extra oxidation, also unproven.)  
As for recent weeks having more impact [EDIT: this post split into the thread below]

> [@HbA1c: do the latest BG samples count for more?](https://forum.fudiabetes.org/t/hba1c-do-the-latest-bg-samples-count-for-more/5237/):
>
> As for recent weeks having more impact, I think it is the opposite, according to a paper that came out a couple months ago. The first 30 days of your last 120-day period should account for about 50% of your result. And the last 30 days of the 120 should only account for about 5% of the result. If you have a source that says different, please let me know.

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