In it they stated that the United States Constitution would grant a competent person a constitutionally protected right to refuse<span> life-saving </span>medical treatment<span> Whether for financial, spiritual or religious reasons, a </span>patient has<span> the ultimate say over what is done to his or her body.</span>
Yes they can such as blood transfusion doctors cannot force you too. Unless you are a child and your parents refuse the medical treatment, in some states they will take your child way if refused it.
GUILLIAN BARRE syndrome the immune systems produces harmful antibodies that attack the nerves. IVIG is a treatment that contains healthy antibodies from donated blood and is the most commonly used treatment for this disease.