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 |
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