. 2016 Jan 1;26(1):1–133. doi: 10.1089/thy.2015.0020

Table 12.

American Thyroid Association Risk Stratification System: Clinical Outcomes Following Total Thyroidectomy and Radioiodine Remnant Ablation or Adjuvant Therapy

ATA risk	Study	NED, %	Biochemical incomplete, %^b	Structural incomplete, %^c
Low	Tuttle et al. (538)	86	11	3
	Castagna et al. (542)	91	ND^a	ND^a
	Vaisman et al. (539)	88	10	2
	Pitoia et al. (543)	78	15	7
Intermediate^a	Tuttle et al. (538)	57	22	21
	Vaisman et al. (539)	63	16	21
	Pitoia et al. (543)	52	14	34
High	Tuttle et al. (538)	14	14	72
	Vaisman et al. (539)	16	12	72
	Pitoia et al. (543)	31	13	56

^{^a}

Because the ATA intermediate- and high-risk groups were merged into a single “high-risk” group in the series by Castagna et al. (542), risk of persistent/recurrent disease for these subgroups is not presented.

^{^b}

Proportion of patients with a biochemical incomplete response. Definition: suppressed Tg >1 ng/mL, TSH-stimulated Tg >10 ng/mL, or rising anti-Tg antibody levels in the absence of structural disease.

^{^c}

Proportion of patients with persistent/recurrent disease that is structural. Definition: structural disease that is either biopsy-proven or highly suspicious for disease with or without abnormal serum Tg.

ND, not determined.