TG and thyroiditis: One month later, she was experiencing depressed mood, and a blood test was performed to check thyroid-related items, which showed a decrease in thyroid hormone levels and an increase in TSH, with TSH 19.6 μIU/mL (normal range: 0.35-4.94), FT3 <1.5 pg/mL (normal range: 1.88-3.18), and FT4 0.79 ng/dL (normal range: 0.7-1.48), which was consistent with the course of destructive thyroiditis.