A high TSH level suggests an underactive thyroid ... include (T3), free T3, reverse T3, and thyroid antibody tests. An optimal TSH level for all people cannot reasonably be established.

A high Tg level is a sign that cancer cells ... thyroid stimulating hormone (TSH), and thyroid antibodies. The combined results can paint a clearer picture of the cause of thyroid disease.

Although TSAb assays have theoretical advantages, some believe that TBII tests, that detect both stimulating (TSAb) and the rare cases of blocking (TBAb/TSBAb) antibodies, are equally useful.