| Response to therapy | ||||
| Excellent | Biochemical incomplete | Structural incomplete | Indeterminate | |
| Nonstimulated Tg | Every one to two years | Every six months | Every six months | 6 to 12 months |
| Stimulated Tg | Not needed | May be repeated at two- to three-year intervals if needed to establish an excellent response to therapy | Not needed | May be repeated at two- to three-year intervals if needed to establish an excellent response to therapy |
| Neck ultrasound | Consider at three- to five-year intervals | Yearly for five years | Yearly for five years | 6- to 12-month intervals for five years |
| Diagnostic WBS | Not indicated | Not usually done* | To evaluate RAI avidity of structural disease | Not usually done* |
| MRI, CT | Not indicated | Not indicated* | 6- to 12-month intervals depending on rate of progression | Not indicated* |
| FDG-PET | Not indicated | Not indicated* | To identify additional sites of disease and for prognostic purposes | Not indicated* |
| Serum TSH¶ | 0.5 to 2 mU/L | 0.1 to 0.5 mU/L | <0.1 mU/L | 0.1 to 0.5 mU/L |
