# Dexcom time lag, and interstitial fluid glucose vs BG

**URL:** <https://forum.fudiabetes.org/t/dexcom-time-lag-and-interstitial-fluid-glucose-vs-bg/2318>\
**Category:** C/GM\
**Tags:** blood-sugar\
**Created:** [October 10, 2017, 8:12pm UTC](https://forum.fudiabetes.org/t/dexcom-time-lag-and-interstitial-fluid-glucose-vs-bg/2318 "2017-10-10T20:12:51Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Michel](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/michel/32/387_2.png) [@Michel](https://forum.fudiabetes.org/u/Michel)\
**Post date:** [October 10, 2017, 8:13pm UTC](https://forum.fudiabetes.org/t/dexcom-time-lag-and-interstitial-fluid-glucose-vs-bg/2318/2 "2017-10-10T20:13:56Z")

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This topic was split from:

> [@How your Dexcom CGM reacts to calibration input](https://forum.fudiabetes.org/t/how-your-dexcom-cgm-reacts-to-calibration-input-soliciting-feedback/2293):
>
> When you enter a calibration value into your Dexcom receiving device, your Dexcom data does not automatically line up on the new value. it is easy to understand why. The measurements from a manual glucose monitor are only specified to be accurate with +/- 20% – an awfully poor expectation, but seemingly the only one that allows a reasonable cost for the strips used to read a BG value. On the other hand, your Dexcom, over time, averages out many cali…

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_[View the full topic](https://forum.fudiabetes.org/t/dexcom-time-lag-and-interstitial-fluid-glucose-vs-bg/2318)._