Hi, I posted a few times at the beginning of my second pregnancy and haven't been back for a while. I came to comment because I was reading about this issue in the August newsletter for the Preeclampsia Foundation.
This is obviously anecdotal and probably not worth a lot, but I found out I was deficient in D after I had my first baby. I developed preeclampsia (actually, HELLP) at the end of that pregnancy. I started on mega supplements of D3 (not the same as the prescription D, which is synthetic and less efficient in your body) and got my levels up into the optimal range. I continued supplementing during my second pregnancy, and just delivered a healthy girl almost a week ago -- no PE this time around.
When I found out I was deficient, I did a lot of research on Vitamin D and learned some things that might be worth sharing here:
1) D3 is for the form your body makes naturally. It is used more efficiently than the synthetic D2 (which is the form that they give in those prescriptions).
2) There is an epidemic of D deficiency in this country, and it doesn't really matter if you live in a hot, sunny place. If you do not get out in the sun without sunblock during certain hours of the day, your body will not make enough Vitamin D to keep the levels optimal.
3) Optimal levels are higher than what doctors consider acceptable. As someone else said, your level should be up around 60.
4) We need a lot more Vitamin D than is recommended or can be found in your average supplement.
I found this website to be extremely helpful to me: www.vitamindcouncil.org.