TG and subacute thyroiditis: Madeddu et al. [4] studied 12 patients with subacute thyroiditis over 3–4 months, ten of whom demonstrated similar patterns with initially elevated Tg values 300 ± 204 ug/L (mean ± SD, a decline to 43 ± 21 ug/L within 20 days of steroid therapy, a further decline to normal values for 20 days and then a rise above normal for approximately 40 days, eventually returning to the normal range.