Re: please explain a "dnc"
Please do listen to the previous poster, I have heard too many times of that same occurance. I had a blighted ovum last April (there was no fetus in the sac, or the fetus had stopped developing very early) and I was given the choice of waiting for a natural m/c or opting for a d&c. I waited and waited for a natural miscarriage and was eventually told I had to do the d&c because there was a risk of hemorraging. I asked for three ultrasounds before I would do it.
I had it done in a hospital, and I was put out completely. It's much more painful emotionally than physically, so tell your wife not to worry about that - she won't feel a thing other than a little cramping afterward, and bleeding. My doctor did not remove all of the tissue, he let me then miscarry much of it in the days following the procedure. This limits the risk of scar tissue building up on the uterus, which could have an effect on future pregnancies (the embryo may have a more difficult time implanting if there is scar tissue present).
Good luck, and I am very sorry for your loss. Hope this helps.