# PDM fails at math?

**URL:** <https://forum.fudiabetes.org/t/pdm-fails-at-math/3051>\
**Category:** Pump\
**Tags:** omnipod, pdm\
**Created:** [January 2, 2018, 1:42am UTC](https://forum.fudiabetes.org/t/pdm-fails-at-math/3051 "2018-01-02T01:42:04Z")\
**Posts on this page:** 1\
**Showing post:** 21

<div class="post-metadata">

**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:** [January 4, 2018, 4:07am UTC](https://forum.fudiabetes.org/t/pdm-fails-at-math/3051/21 "2018-01-04T04:07:30Z")

</div>

> [@Eric](#):
>
> Correction bolus can’t be extended. Only meal bolus can be extended.
> 
> So it matters on the BG number you enter because that part (the correction) will not be extended, so the percentage doesn’t include that.

Interesting. We never use a BG correction calculated by the PDM, so this may be why we have never seen this behavior.

---

_[View the full topic](https://forum.fudiabetes.org/t/pdm-fails-at-math/3051)._