Fig. 3

Nomogram to predict ablation success for patients with thyroid cancer receiving high-dose I-131 therapy based on multivariable analysis and example cases. A Nomogram. Each factor was translated into points by drawing a line straight up, after which all points were added to a total point score. The total score was then translated into the predictive value axis by drawing a line straight down to estimate the ablation success probability. B A 64-year-old male patient with TSH, Tg and TgAb levels of 40.1 mIU/L, 0.1 ng/mL and 28.14 IU/mL at ablation and no evidence of thyroiditis on pathology. Neck counts were 128,809 on Early scan and 5,438 on Delayed scan, with 95.8% reduction rate. This patient had ablation success. Nomogram total points were 2.5 + 100 + 0 + 5 + 37.5 + 17.5 = 162.5, which translates into a predictive value of 68% of ablation success. C A 40-year-old female patient without thyroiditis on pathology. During ablation, TSH, Tg and TgAb levels were 39.0 mIU/L, 5.1 ng/mL and 9.9 IU/mL, and neck counts were 51,791 on Early scan and 2,406 on Delayed scan, with 95.4% reduction rate. This patient had ablation failure. Nomogram total points were 0 + 0 + 67.5 + 0 + 0 + 17.5 = 85, which translates into a predictive value of 18% of ablation success