I had a total thyroidectomy (they removed my entire thyroid) due to cancer. They tried to preserve my parathyroids, so I have 3 of the 4. I must take a calcium supplement twice daily, as your parathyroids are responsible for getting the calcium broken down for your heart, etc. Where is your mother having surgery? I had mine done at MD Anderson in Houston with a Head and Neck surgeon. Please research the surgeon carefully and find out his success rate. How many patients lost their voice, how many can't breathe normally?, etc. The surgeon is in a very tricky spot and if he makes a tiny mistake; it can have devastating, lasting effects, including death. I believe the single most important factor in the success of your Mom's surgery is the skill of the surgeon. Also, pick up a book titled, Your complete Thyroid. It is written by a Dr. and his wife who also has thyroid cancer. It is the best resource that I have. I hope that this will help you. Blessings to you and your Mom.