Help with latest lab

[tangerinelz3]

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 Antibody   <.90(***IU/L)

Thanks!

[Mark Lupo, M.D.]

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.

[tangerinelz3]

This is the rest of the labs:

T4 Free 2.9 (0.8-1.8)
T3 Free 7.9 (2.3-4.2)
T3 Total 272 (76-181)