Document Classification

Section Type: METHODS

Text: (a) Strict criteria based on three tests : (i) USG negative, (ii) no tracer uptake or less than twice the background activity in the thyroid bed on DxWBS and/or up to 0. 2 % RAIU, and (iii) Tg < 0. 2 ng/ml ; (b) lax criteria based on three tests : (i) USG negative, (ii) no tracer uptake or less than twice the background activity in the thyroid bed on DxWBS and/or 0. 2 % RAIU, and (iii) Tg < 2 ng/ml ; (c) strict criteria based on two tests : (i) USG negative and (ii) Tg < 0. 2 ng/ml ; (d) lax criteria based on two test : (i) USG negative and (ii) Tg < 2 ng/ml.