What does it mean if a report says "Thyroglobulin autoantibodies in this patient's serum may cause interference in the estimation of thyroglobulin. Is this good or bad? Thyroglobulin is 1.7. Thyroid peroxidase Ab is 1 and Thyroglobulin b is H97. I do not understand that. I am permanently tired fall asleep and have three nodules on the thyroid in length about 2.5cm. Doctor say I am normal? Does this agree but I do not feel well overall? Thank you