Hi, I am hyperthyroid, have a follow up with my doctor this Thursday for an ultrasound and to discuss my lab results. The following I don't understand what it means, can you help?
TSH Receptor Ab is a blood test for Graves' disease that in your case appears to be negative. It may be necessary to do an I-123 uptake (pending ultrasound results) to determine Graves' vs thyroiditis vs toxic nodule(s) as the cause of the hyperthyroidism.