Hi Deb,
It is important to remember that we can't assimilate and process elemental calcium unless we have Vitamin D - it is not the most soluble of minerals either. As most people are less mobile with CRPS and probably have less sun exposure we can't rely on synthesising our own Vit. D in sufficient quantities.

Two things to consider, initially: it may be either leaching in proportion to changed activity / sun exposure and as a result of the RSD but it could be as simple as needing the caltrate with Vit D added. This applies to people unaffected with RSD too.....or your diet may be adequate but you aren't assimilating it.

Taylas' comments re serum Ca levels are spot-on. It may be worthwhile talking to your doc about this - a Vit D supplement might help, monitoring and then starting the supplement when homeostasis is again achieved.

I would respectfully start with this discussion with your doc. If you need more bounce it back please. The last thing you want is a niggling thought to distress - RSD is bad enough.

I do hope you can obtain an answer easily.

Best regards
Auberon