Ckl,  I have learnt so much from Carol’s book and I have to say that if you don’t understand something, it is the doctors job to explain it to you, so good for you for asking!!  I think the book is fantastic as does my son’s endo who has bought several copies to lend to parents.  I often refer to it and I truly believe, we as parents need as much information about CAH as we can get, so we can question, to ensure our children are getting the best care. Good luck.