Hi Joanne,
welcome to neurotalk, it looks as if everyone has done a great job in answering your quesions.
I myself have had IVIG on several occasions for myasthenia gravis, and this a good forum to ask questions about ivig, because alot of us have received it. So if you have any further questions feel free to drop by, we are a friendly lot.
http://neurotalk.psychcentral.com/forum77.html
take care
Kate