# Using CGM for Insulin Dosing **URL:** \ **Category:** C/GM\ **Tags:** medicare, fda\ **Created:** [September 17, 2017, 5:03pm UTC](https://forum.fudiabetes.org/t/using-cgm-for-insulin-dosing/2032 "2017-09-17T17:03:41Z")\ **Posts on this page:** 1\ **Showing post:** 14
**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:** [September 18, 2017, 1:09am UTC](https://forum.fudiabetes.org/t/using-cgm-for-insulin-dosing/2032/14 "2017-09-18T01:09:28Z")
> [@dave](#): > > the G5 doesn’t ever stray far from meter readings. Welcome, @dave! We love our Dexcom, and we dose from it too! But I have posted and documented several patterns on this forum where you can see the G5 is way off, in particular in transitions. One example: > [@When CGMs lie, and when a deep low is really a nice landing](https://forum.fudiabetes.org/t/when-cgms-lie-and-when-a-deep-low-is-really-a-nice-landing/1336): > > I have mentioned several times in passing that I think many Dexcom lows, when they come off a steep slope, aren’t really lows. Today I decided to prove it. My son calibrated his CGM this morning at 8:37 AM and was off by 2: his Dexcom has been very accurate for the past two days (so we can assume that, when stable, his CGM accurately reflects his real BG). Later this morning, he had a major puberty peak that took him to about 250. He injected large quantities of insulin and came down quickly. W… --- _[View the full topic](https://forum.fudiabetes.org/t/using-cgm-for-insulin-dosing/2032)._