I recently received the book "what you need to know about pernicious anemia and vitamin B12 deficiency". I have managed to read through chapter 4 which discusses problems in diagnosing pernicious anemia. I am confused. I am in the United States and therefore trying to determine which test to request. All testing will be paid for out of my own pocket as I have no health insurance, so cost is a factor.
I understand that a test for intrensic factor antibodies that comes back negative may be a false negative 40-60% of the time. So i am considering testing for parietal cell antibodies first.
Question 1: if a test for parietal cell antibodies comes back negative is it still possible to have intrinsic Factor antibodies?
I am having additional testing done that requires that I be fasting to get a glucose level. So that leads to question 2.
Question 2: if parietal cell antibodies and intrinsic factor antibodies are produced in the gastric juices do I need to eat before having these tests done? If so how long after eating should I wait before being tested?
Thank you in advance for any and all replies