"Dr. C my ANA test said I have autoimmune disease. Is that true?" There are a lot of misunderstandings about blood tests and autoimmunity. What do you think the best answer is and why? Believe it or not the best answer is none of the above. Autoimmune diseases cannot be diagnosed by blood tests alone. Their diagnosis may also require imaging (ultrasound, x-rays), and a full review of the patient’s unexplained symptoms. Many are told that blood tests can screen for autoimmune diseases. Practition